138972403444 has 24 divisors (see below), whose sum is σ = 277992509760. Its totient is φ = 59549379456.

The previous prime is 138972403439. The next prime is 138972403501. The reversal of 138972403444 is 444304279831.

138972403444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138972403444² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258709 + ... + 587260.

It is an arithmetic number, because the mean of its divisors is an integer number (11583021240).

Almost surely, 2^138972403444 is an apocalyptic number.

138972403444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138972403444 is an abundant number, since it is smaller than the sum of its proper divisors (139020106316).

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

138972403444 is a wasteful number, since it uses less digits than its factorization.

138972403444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851847 (or 851845 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 49.

The spelling of 138972403444 in words is "one hundred thirty-eight billion, nine hundred seventy-two million, four hundred three thousand, four hundred forty-four".