138625616 has 20 divisors (see below), whose sum is σ = 284386932. Its totient is φ = 65235456.

The previous prime is 138625561. The next prime is 138625621. The reversal of 138625616 is 616526831.

It can be written as a sum of positive squares in 2 ways, for example, as 41011216 + 97614400 = 6404^2 + 9880^2 .

It is a super-2 number, since 2×138625616² = 38434122822758912, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 138625616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254555 + ... + 255098.

Almost surely, 2^138625616 is an apocalyptic number.

138625616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138625616 is an abundant number, since it is smaller than the sum of its proper divisors (145761316).

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

138625616 is a wasteful number, since it uses less digits than its factorization.

138625616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509678 (or 509672 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 138625616 is about 11773.9379988176. The cubic root of 138625616 is about 517.5446573207.

The spelling of 138625616 in words is "one hundred thirty-eight million, six hundred twenty-five thousand, six hundred sixteen".