138625536 has 80 divisors (see below), whose sum is σ = 422097984. Its totient is φ = 39604224.

The previous prime is 138625519. The next prime is 138625541. The reversal of 138625536 is 635526831.

It is a junction number, because it is equal to n+sod(n) for n = 138625494 and 138625503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4306 + ... + 17198.

Almost surely, 2^138625536 is an apocalyptic number.

138625536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138625536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211048992).

138625536 is an abundant number, since it is smaller than the sum of its proper divisors (283472448).

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

138625536 is an equidigital number, since it uses as much as digits as its factorization.

138625536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12921 (or 12905 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 138625536 is about 11773.9346014831. The cubic root of 138625536 is about 517.5445577634.

The spelling of 138625536 in words is "one hundred thirty-eight million, six hundred twenty-five thousand, five hundred thirty-six".