18138464 has 24 divisors (see below), whose sum is σ = 37590840. Its totient is φ = 8591616.

The previous prime is 18138451. The next prime is 18138487. The reversal of 18138464 is 46483181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14309 + ... + 15524.

It is an arithmetic number, because the mean of its divisors is an integer number (1566285).

Almost surely, 2^18138464 is an apocalyptic number.

It is an amenable number.

18138464 is an abundant number, since it is smaller than the sum of its proper divisors (19452376).

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

18138464 is a wasteful number, since it uses less digits than its factorization.

18138464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29862 (or 29854 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 18138464 is about 4258.9275645402. The cubic root of 18138464 is about 262.7444205668.

The spelling of 18138464 in words is "eighteen million, one hundred thirty-eight thousand, four hundred sixty-four".