12977718 has 32 divisors (see below), whose sum is σ = 28089600. Its totient is φ = 3973536.

The previous prime is 12977717. The next prime is 12977743. The reversal of 12977718 is 81777921.

It is a self number, because there is not a number n which added to its sum of digits gives 12977718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12977717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29343 + ... + 29781.

It is an arithmetic number, because the mean of its divisors is an integer number (877800).

Almost surely, 2^12977718 is an apocalyptic number.

12977718 is an abundant number, since it is smaller than the sum of its proper divisors (15111882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12977718 is a wasteful number, since it uses less digits than its factorization.

12977718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836.

The product of its digits is 49392, while the sum is 42.

The square root of 12977718 is about 3602.4599928382. The cubic root of 12977718 is about 234.9990523577. Note that the first 3 decimals are identical.

It can be divided in two parts, 129777 and 18, that added together give a triangular number (129795 = T₅₀₉).

The spelling of 12977718 in words is "twelve million, nine hundred seventy-seven thousand, seven hundred eighteen".