138506432 has 28 divisors (see below), whose sum is σ = 275463000. Its totient is φ = 69098496.

The previous prime is 138506413. The next prime is 138506443. The reversal of 138506432 is 234605831.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 29768 + ... + 34104.

Almost surely, 2^138506432 is an apocalyptic number.

It is an amenable number.

138506432 is a deficient number, since it is larger than the sum of its proper divisors (136956568).

138506432 is an equidigital number, since it uses as much as digits as its factorization.

138506432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4848 (or 4838 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 138506432 is about 11768.8755622617. The cubic root of 138506432 is about 517.3962943411.

The spelling of 138506432 in words is "one hundred thirty-eight million, five hundred six thousand, four hundred thirty-two".