12777945 has 8 divisors (see below), whose sum is σ = 20444736. Its totient is φ = 6814896.

The previous prime is 12777943. The next prime is 12777967. The reversal of 12777945 is 54977721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12777945 - 2¹ = 12777943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12777897 and 12777906.

It is not an unprimeable number, because it can be changed into a prime (12777943) 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, 425917 + ... + 425946.

It is an arithmetic number, because the mean of its divisors is an integer number (2555592).

Almost surely, 2^12777945 is an apocalyptic number.

12777945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12777945 is a deficient number, since it is larger than the sum of its proper divisors (7666791).

12777945 is an equidigital number, since it uses as much as digits as its factorization.

12777945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851871.

The product of its digits is 123480, while the sum is 42.

The square root of 12777945 is about 3574.6251551736. The cubic root of 12777945 is about 233.7869892945.

The spelling of 12777945 in words is "twelve million, seven hundred seventy-seven thousand, nine hundred forty-five".