Base | Representation |
---|---|
bin | 10111110010000… |
… | …010001000010011 |
3 | 1000210202212222110 |
4 | 113302002020103 |
5 | 1304120220031 |
6 | 103331440403 |
7 | 12613242444 |
oct | 2762021023 |
9 | 1023685873 |
10 | 398991891 |
11 | 195247571 |
12 | b1756103 |
13 | 6487a79c |
14 | 3adc12cb |
15 | 25064c46 |
hex | 17c82213 |
398991891 has 8 divisors (see below), whose sum is σ = 535175424. Its totient is φ = 264401480.
The previous prime is 398991863. The next prime is 398991899. The reversal of 398991891 is 198199893.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 398991891 - 219 = 398467603 is a prime.
It is not an unprimeable number, because it can be changed into a prime (398991899) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397695 + ... + 398696.
It is an arithmetic number, because the mean of its divisors is an integer number (66896928).
Almost surely, 2398991891 is an apocalyptic number.
398991891 is a deficient number, since it is larger than the sum of its proper divisors (136183533).
398991891 is a wasteful number, since it uses less digits than its factorization.
398991891 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 796561.
The product of its digits is 1259712, while the sum is 57.
The square root of 398991891 is about 19974.7813755245. The cubic root of 398991891 is about 736.1867947775.
The spelling of 398991891 in words is "three hundred ninety-eight million, nine hundred ninety-one thousand, eight hundred ninety-one".
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