138656994 has 16 divisors (see below), whose sum is σ = 316930368. Its totient is φ = 39616272.

The previous prime is 138656977. The next prime is 138657007. The reversal of 138656994 is 499656831.

It is a Curzon number.

It is an unprimeable number.

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, 1650637 + ... + 1650720.

It is an arithmetic number, because the mean of its divisors is an integer number (19808148).

Almost surely, 2^138656994 is an apocalyptic number.

138656994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138656994 is an abundant number, since it is smaller than the sum of its proper divisors (178273374).

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

138656994 is a wasteful number, since it uses less digits than its factorization.

138656994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301369.

The product of its digits is 1399680, while the sum is 51.

The square root of 138656994 is about 11775.2704427542. The cubic root of 138656994 is about 517.5837032335.

The spelling of 138656994 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, nine hundred ninety-four".