18478997400 has 48 divisors (see below), whose sum is σ = 57284893800. Its totient is φ = 4927732480.

The previous prime is 18478997389. The next prime is 18478997491. The reversal of 18478997400 is 479987481.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15398565 + ... + 15399764.

Almost surely, 2^18478997400 is an apocalyptic number.

18478997400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18478997400 is an abundant number, since it is smaller than the sum of its proper divisors (38805896400).

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

18478997400 is a wasteful number, since it uses less digits than its factorization.

18478997400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30798348 (or 30798339 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 18478997400 in words is "eighteen billion, four hundred seventy-eight million, nine hundred ninety-seven thousand, four hundred".