138885256 has 8 divisors (see below), whose sum is σ = 260409870. Its totient is φ = 69442624.

The previous prime is 138885221. The next prime is 138885259. The reversal of 138885256 is 652588831.

It can be written as a sum of positive squares in only one way, i.e., 99321156 + 39564100 = 9966^2 + 6290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×138885256² = 38578228668371072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138885259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8680321 + ... + 8680336.

Almost surely, 2^138885256 is an apocalyptic number.

It is an amenable number.

138885256 is a deficient number, since it is larger than the sum of its proper divisors (121524614).

138885256 is a wasteful number, since it uses less digits than its factorization.

138885256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17360663 (or 17360659 counting only the distinct ones).

The product of its digits is 460800, while the sum is 46.

The square root of 138885256 is about 11784.9588883458. The cubic root of 138885256 is about 517.8675689941.

The spelling of 138885256 in words is "one hundred thirty-eight million, eight hundred eighty-five thousand, two hundred fifty-six".