12918857 has 4 divisors (see below), whose sum is σ = 14764416. Its totient is φ = 11073300.

The previous prime is 12918853. The next prime is 12918887. The reversal of 12918857 is 75881921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12918857 - 2² = 12918853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12918853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922769 + ... + 922782.

It is an arithmetic number, because the mean of its divisors is an integer number (3691104).

Almost surely, 2^12918857 is an apocalyptic number.

It is an amenable number.

12918857 is a deficient number, since it is larger than the sum of its proper divisors (1845559).

12918857 is an equidigital number, since it uses as much as digits as its factorization.

12918857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845558.

The product of its digits is 40320, while the sum is 41.

The square root of 12918857 is about 3594.2811520525. The cubic root of 12918857 is about 234.6432310859.

The spelling of 12918857 in words is "twelve million, nine hundred eighteen thousand, eight hundred fifty-seven".