18713904 has 120 divisors (see below), whose sum is σ = 55954752. Its totient is φ = 5343360.

The previous prime is 18713899. The next prime is 18713911. The reversal of 18713904 is 40931781.

18713904 = 891² + 892² + ... + 913².

It is a Harshad number since it is a multiple of its sum of digits (33).

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 23 ways as a sum of consecutive naturals, for example, 279279 + ... + 279345.

Almost surely, 2^18713904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18713904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27977376).

18713904 is an abundant number, since it is smaller than the sum of its proper divisors (37240848).

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

18713904 is a wasteful number, since it uses less digits than its factorization.

18713904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 18713904 is about 4325.9570039472. The cubic root of 18713904 is about 265.4940540091.

It can be divided in two parts, 1871 and 3904, that added together give a palindrome (5775).

The spelling of 18713904 in words is "eighteen million, seven hundred thirteen thousand, nine hundred four".