18139348 has 24 divisors (see below), whose sum is σ = 32457600. Its totient is φ = 8868288.

The previous prime is 18139307. The next prime is 18139367. The reversal of 18139348 is 84393181.

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, 43083 + ... + 43501.

It is an arithmetic number, because the mean of its divisors is an integer number (1352400).

Almost surely, 2^18139348 is an apocalyptic number.

It is an amenable number.

18139348 is a deficient number, since it is larger than the sum of its proper divisors (14318252).

18139348 is a wasteful number, since it uses less digits than its factorization.

18139348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 637 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 18139348 is about 4259.0313452709. The cubic root of 18139348 is about 262.7486888866.

The spelling of 18139348 in words is "eighteen million, one hundred thirty-nine thousand, three hundred forty-eight".