138955994 has 16 divisors (see below), whose sum is σ = 228306600. Its totient is φ = 63135744.

The previous prime is 138955969. The next prime is 138956029. The reversal of 138955994 is 499559831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 130759225 + 8196769 = 11435^2 + 2863^2 .

It is a Curzon number.

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, 69479 + ... + 71450.

Almost surely, 2^138955994 is an apocalyptic number.

138955994 is a deficient number, since it is larger than the sum of its proper divisors (89350606).

138955994 is a wasteful number, since it uses less digits than its factorization.

138955994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140977.

The product of its digits is 1749600, while the sum is 53.

The square root of 138955994 is about 11787.9597047157. The cubic root of 138955994 is about 517.9554753698.

The spelling of 138955994 in words is "one hundred thirty-eight million, nine hundred fifty-five thousand, nine hundred ninety-four".