138178256 has 10 divisors (see below), whose sum is σ = 267720402. Its totient is φ = 69089120.

The previous prime is 138178219. The next prime is 138178259. The reversal of 138178256 is 652871831.

It can be written as a sum of positive squares in only one way, i.e., 77088400 + 61089856 = 8780^2 + 7816^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138178259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4318055 + ... + 4318086.

Almost surely, 2^138178256 is an apocalyptic number.

138178256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138178256 is a deficient number, since it is larger than the sum of its proper divisors (129542146).

138178256 is an equidigital number, since it uses as much as digits as its factorization.

138178256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8636149 (or 8636143 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 138178256 is about 11754.9247551824. The cubic root of 138178256 is about 516.9873330005.

The spelling of 138178256 in words is "one hundred thirty-eight million, one hundred seventy-eight thousand, two hundred fifty-six".