138313644 has 48 divisors (see below), whose sum is σ = 381561600. Its totient is φ = 38154816.

The previous prime is 138313639. The next prime is 138313667. The reversal of 138313644 is 446313831.

138313644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25954 + ... + 30825.

It is an arithmetic number, because the mean of its divisors is an integer number (7949200).

Almost surely, 2^138313644 is an apocalyptic number.

138313644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138313644 is an abundant number, since it is smaller than the sum of its proper divisors (243247956).

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

138313644 is a wasteful number, since it uses less digits than its factorization.

138313644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56822 (or 56820 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 138313644 is about 11760.6821230743. The cubic root of 138313644 is about 517.1561271252.

The spelling of 138313644 in words is "one hundred thirty-eight million, three hundred thirteen thousand, six hundred forty-four".