138490923 has 16 divisors (see below), whose sum is σ = 188170496. Its totient is φ = 90577440.

The previous prime is 138490909. The next prime is 138490927. The reversal of 138490923 is 329094831.

It is a de Polignac number, because none of the positive numbers 2^k-138490923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138490927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94986 + ... + 96432.

It is an arithmetic number, because the mean of its divisors is an integer number (11760656).

Almost surely, 2^138490923 is an apocalyptic number.

138490923 is a deficient number, since it is larger than the sum of its proper divisors (49679573).

138490923 is a wasteful number, since it uses less digits than its factorization.

138490923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 138490923 is about 11768.2166448447. The cubic root of 138490923 is about 517.3769821245.

The spelling of 138490923 in words is "one hundred thirty-eight million, four hundred ninety thousand, nine hundred twenty-three".