18739432 has 32 divisors (see below), whose sum is σ = 36000000. Its totient is φ = 9142848.

The previous prime is 18739429. The next prime is 18739433. The reversal of 18739432 is 23493781.

It is a junction number, because it is equal to n+sod(n) for n = 18739391 and 18739400.

It is not an unprimeable number, because it can be changed into a prime (18739433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94069 + ... + 94267.

It is an arithmetic number, because the mean of its divisors is an integer number (1125000).

Almost surely, 2^18739432 is an apocalyptic number.

It is an amenable number.

18739432 is a deficient number, since it is larger than the sum of its proper divisors (17260568).

18739432 is a wasteful number, since it uses less digits than its factorization.

18739432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 429 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 18739432 is about 4328.9065593981. The cubic root of 18739432 is about 265.6147210232.

The spelling of 18739432 in words is "eighteen million, seven hundred thirty-nine thousand, four hundred thirty-two".