138694976 has 56 divisors (see below), whose sum is σ = 333061056. Its totient is φ = 55941120.

The previous prime is 138694973. The next prime is 138694987. The reversal of 138694976 is 679496831.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138694973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1490 + ... + 16721.

Almost surely, 2^138694976 is an apocalyptic number.

138694976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138694976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166530528).

138694976 is an abundant number, since it is smaller than the sum of its proper divisors (194366080).

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

138694976 is a wasteful number, since it uses less digits than its factorization.

138694976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18247 (or 18237 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 53.

The square root of 138694976 is about 11776.8831190600. The cubic root of 138694976 is about 517.6309591006.

The spelling of 138694976 in words is "one hundred thirty-eight million, six hundred ninety-four thousand, nine hundred seventy-six".