138719644 has 24 divisors (see below), whose sum is σ = 287007840. Its totient is φ = 57400896.

The previous prime is 138719641. The next prime is 138719653. The reversal of 138719644 is 446917831.

It is a self number, because there is not a number n which added to its sum of digits gives 138719644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138719641) by changing a digit.

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, 84607 + ... + 86230.

It is an arithmetic number, because the mean of its divisors is an integer number (11958660).

Almost surely, 2^138719644 is an apocalyptic number.

138719644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138719644 is an abundant number, since it is smaller than the sum of its proper divisors (148288196).

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

138719644 is a wasteful number, since it uses less digits than its factorization.

138719644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170877 (or 170875 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 138719644 is about 11777.9303784663. The cubic root of 138719644 is about 517.6616455367.

The spelling of 138719644 in words is "one hundred thirty-eight million, seven hundred nineteen thousand, six hundred forty-four".