138251394 has 16 divisors (see below), whose sum is σ = 307225440. Its totient is φ = 46083780.

The previous prime is 138251387. The next prime is 138251411. The reversal of 138251394 is 493152831.

138251394 is a `hidden beast` number, since 13 + 8 + 251 + 394 = 666.

It is a super-2 number, since 2×138251394² = 38226895885886472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1280052 + ... + 1280159.

It is an arithmetic number, because the mean of its divisors is an integer number (19201590).

Almost surely, 2^138251394 is an apocalyptic number.

138251394 is an abundant number, since it is smaller than the sum of its proper divisors (168974046).

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

138251394 is a wasteful number, since it uses less digits than its factorization.

138251394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560222 (or 2560216 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 138251394 is about 11758.0352950652. The cubic root of 138251394 is about 517.0785310211.

The spelling of 138251394 in words is "one hundred thirty-eight million, two hundred fifty-one thousand, three hundred ninety-four".