12918977 has 4 divisors (see below), whose sum is σ = 13234116. Its totient is φ = 12603840.

The previous prime is 12918943. The next prime is 12918979. The reversal of 12918977 is 77981921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2876416 + 10042561 = 1696^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 12918977 - 2⁸ = 12918721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12918979) 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, 157508 + ... + 157589.

It is an arithmetic number, because the mean of its divisors is an integer number (3308529).

Almost surely, 2^12918977 is an apocalyptic number.

It is an amenable number.

12918977 is a deficient number, since it is larger than the sum of its proper divisors (315139).

12918977 is an equidigital number, since it uses as much as digits as its factorization.

12918977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315138.

The product of its digits is 63504, while the sum is 44.

The square root of 12918977 is about 3594.2978451987. The cubic root of 12918977 is about 234.6439575975.

The spelling of 12918977 in words is "twelve million, nine hundred eighteen thousand, nine hundred seventy-seven".