138974886 has 32 divisors (see below), whose sum is σ = 317184480. Its totient is φ = 45072288.

The previous prime is 138974831. The next prime is 138974893. The reversal of 138974886 is 688479831.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 32781 + ... + 36776.

It is an arithmetic number, because the mean of its divisors is an integer number (9912015).

Almost surely, 2^138974886 is an apocalyptic number.

138974886 is an abundant number, since it is smaller than the sum of its proper divisors (178209594).

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

138974886 is a wasteful number, since it uses less digits than its factorization.

138974886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69605 (or 69599 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 138974886 is about 11788.7610036000. The cubic root of 138974886 is about 517.9789474805.

The spelling of 138974886 in words is "one hundred thirty-eight million, nine hundred seventy-four thousand, eight hundred eighty-six".