18977746 has 16 divisors (see below), whose sum is σ = 30288384. Its totient is φ = 8887104.

The previous prime is 18977743. The next prime is 18977747. The reversal of 18977746 is 64777981.

It is a self number, because there is not a number n which added to its sum of digits gives 18977746.

It is not an unprimeable number, because it can be changed into a prime (18977743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6331 + ... + 8833.

It is an arithmetic number, because the mean of its divisors is an integer number (1893024).

Almost surely, 2^18977746 is an apocalyptic number.

18977746 is a deficient number, since it is larger than the sum of its proper divisors (11310638).

18977746 is a wasteful number, since it uses less digits than its factorization.

18977746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2745.

The product of its digits is 592704, while the sum is 49.

The square root of 18977746 is about 4356.3454867584. The cubic root of 18977746 is about 266.7359441536.

The spelling of 18977746 in words is "eighteen million, nine hundred seventy-seven thousand, seven hundred forty-six".