18979792 has 20 divisors (see below), whose sum is σ = 39602500. Its totient is φ = 8759808.

The previous prime is 18979787. The next prime is 18979801. The reversal of 18979792 is 29797981.

It can be written as a sum of positive squares in 2 ways, for example, as 968256 + 18011536 = 984^2 + 4244^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 45417 + ... + 45832.

It is an arithmetic number, because the mean of its divisors is an integer number (1980125).

Almost surely, 2^18979792 is an apocalyptic number.

It is an amenable number.

18979792 is an abundant number, since it is smaller than the sum of its proper divisors (20622708).

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

18979792 is a wasteful number, since it uses less digits than its factorization.

18979792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91270 (or 91264 counting only the distinct ones).

The product of its digits is 571536, while the sum is 52.

The square root of 18979792 is about 4356.5803102893. The cubic root of 18979792 is about 266.7455294530.

It can be divided in two parts, 1897979 and 2, that added together give a palindrome (1897981).

The spelling of 18979792 in words is "eighteen million, nine hundred seventy-nine thousand, seven hundred ninety-two".