138856844 has 24 divisors (see below), whose sum is σ = 280267680. Its totient is φ = 58962816.

The previous prime is 138856811. The next prime is 138856853. The reversal of 138856844 is 448658831.

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, 19697 + ... + 25800.

It is an arithmetic number, because the mean of its divisors is an integer number (11677820).

Almost surely, 2^138856844 is an apocalyptic number.

138856844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138856844 is an abundant number, since it is smaller than the sum of its proper divisors (141410836).

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

138856844 is a wasteful number, since it uses less digits than its factorization.

138856844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45617 (or 45615 counting only the distinct ones).

The product of its digits is 737280, while the sum is 47.

The square root of 138856844 is about 11783.7533918527. The cubic root of 138856844 is about 517.8322528940.

The spelling of 138856844 in words is "one hundred thirty-eight million, eight hundred fifty-six thousand, eight hundred forty-four".