18139488 has 24 divisors (see below), whose sum is σ = 47616408. Its totient is φ = 6046464.

The previous prime is 18139487. The next prime is 18139501. The reversal of 18139488 is 88493181.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94381 + ... + 94572.

It is an arithmetic number, because the mean of its divisors is an integer number (1984017).

Almost surely, 2^18139488 is an apocalyptic number.

It is an amenable number.

18139488 is an abundant number, since it is smaller than the sum of its proper divisors (29476920).

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

18139488 is a wasteful number, since it uses less digits than its factorization.

18139488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188966 (or 188958 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 18139488 is about 4259.0477809013. The cubic root of 18139488 is about 262.7493648521.

The spelling of 18139488 in words is "eighteen million, one hundred thirty-nine thousand, four hundred eighty-eight".