138756244 has 48 divisors (see below), whose sum is σ = 283360896. Its totient is φ = 58752000.

The previous prime is 138756199. The next prime is 138756257. The reversal of 138756244 is 442657831.

It is a junction number, because it is equal to n+sod(n) for n = 138756197 and 138756206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76144 + ... + 77944.

It is an arithmetic number, because the mean of its divisors is an integer number (5903352).

Almost surely, 2^138756244 is an apocalyptic number.

It is an amenable number.

138756244 is an abundant number, since it is smaller than the sum of its proper divisors (144604652).

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

138756244 is a wasteful number, since it uses less digits than its factorization.

138756244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936 (or 1934 counting only the distinct ones).

The product of its digits is 161280, while the sum is 40.

The square root of 138756244 is about 11779.4840294471. The cubic root of 138756244 is about 517.7071684097.

The spelling of 138756244 in words is "one hundred thirty-eight million, seven hundred fifty-six thousand, two hundred forty-four".