| Base | Representation |
|---|---|
| bin | 110001001010… |
| … | …101101110001 |
| 3 | 220020211022100 |
| 4 | 301022231301 |
| 5 | 11244421240 |
| 6 | 1140131013 |
| 7 | 214361046 |
| oct | 61125561 |
| 9 | 26224270 |
| 10 | 12888945 |
| 11 | 7303723 |
| 12 | 4396a69 |
| 13 | 28937c4 |
| 14 | 19d71cd |
| 15 | 11e8e30 |
| hex | c4ab71 |
12888945 has 12 divisors (see below), whose sum is σ = 22340916. Its totient is φ = 6874080.
The previous prime is 12888943. The next prime is 12888971. The reversal of 12888945 is 54988821.
It is a happy number.
12888945 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 2 ways, for example, as 10036224 + 2852721 = 3168^2 + 1689^2 .
It is not a de Polignac number, because 12888945 - 21 = 12888943 is a prime.
It is a super-2 number, since 2×128889452 = 332249806426050, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 286421 = 12888945 / (1 + 2 + 8 + 8 + 8 + 9 + 4 + 5).
It is a self number, because there is not a number n which added to its sum of digits gives 12888945.
It is not an unprimeable number, because it can be changed into a prime (12888943) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143166 + ... + 143255.
It is an arithmetic number, because the mean of its divisors is an integer number (1861743).
Almost surely, 212888945 is an apocalyptic number.
12888945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
12888945 is a deficient number, since it is larger than the sum of its proper divisors (9451971).
12888945 is a wasteful number, since it uses less digits than its factorization.
12888945 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 286432 (or 286429 counting only the distinct ones).
The product of its digits is 184320, while the sum is 45.
The square root of 12888945 is about 3590.1176860933. The cubic root of 12888945 is about 234.4619954383.
The spelling of 12888945 in words is "twelve million, eight hundred eighty-eight thousand, nine hundred forty-five".
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