18988440404 has 24 divisors (see below), whose sum is σ = 34142602368. Its totient is φ = 9233632800.

The previous prime is 18988440397. The next prime is 18988440439. The reversal of 18988440404 is 40404488981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332129 + ... + 385079.

It is an arithmetic number, because the mean of its divisors is an integer number (1422608432).

Almost surely, 2^18988440404 is an apocalyptic number.

It is an amenable number.

18988440404 is a deficient number, since it is larger than the sum of its proper divisors (15154161964).

18988440404 is a wasteful number, since it uses less digits than its factorization.

18988440404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55415 (or 55413 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 50.

The spelling of 18988440404 in words is "eighteen billion, nine hundred eighty-eight million, four hundred forty thousand, four hundred four".