138772844 has 12 divisors (see below), whose sum is σ = 277545744. Its totient is φ = 59474064.

The previous prime is 138772817. The next prime is 138772847. The reversal of 138772844 is 448277831.

138772844 is an admirable number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 138772795 and 138772804.

It is not an unprimeable number, because it can be changed into a prime (138772847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2478059 + ... + 2478114.

It is an arithmetic number, because the mean of its divisors is an integer number (23128812).

Almost surely, 2^138772844 is an apocalyptic number.

138772844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138772844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138772844 is a wasteful number, since it uses less digits than its factorization.

138772844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4956184 (or 4956182 counting only the distinct ones).

The product of its digits is 301056, while the sum is 44.

The square root of 138772844 is about 11780.1886232776. The cubic root of 138772844 is about 517.7278127571.

The spelling of 138772844 in words is "one hundred thirty-eight million, seven hundred seventy-two thousand, eight hundred forty-four".