12977818 has 16 divisors (see below), whose sum is σ = 22314240. Its totient is φ = 5545296.

The previous prime is 12977813. The next prime is 12977821. The reversal of 12977818 is 81877921.

It is a happy number.

It is a super-2 number, since 2×12977818² = 336847520082248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12977813) 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, 4255 + ... + 6637.

It is an arithmetic number, because the mean of its divisors is an integer number (1394640).

Almost surely, 2^12977818 is an apocalyptic number.

12977818 is a deficient number, since it is larger than the sum of its proper divisors (9336422).

12977818 is a wasteful number, since it uses less digits than its factorization.

12977818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781.

The product of its digits is 56448, while the sum is 43.

The square root of 12977818 is about 3602.4738722161. The cubic root of 12977818 is about 234.9996559524. Note that the first 3 decimals are identical.

The spelling of 12977818 in words is "twelve million, nine hundred seventy-seven thousand, eight hundred eighteen".