138281256 has 40 divisors (see below), whose sum is σ = 387317370. Its totient is φ = 46093536.

The previous prime is 138281243. The next prime is 138281257. The reversal of 138281256 is 652182831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 131469156 + 6812100 = 11466^2 + 2610^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 138281256.

It is not an unprimeable number, because it can be changed into a prime (138281257) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 106051 + ... + 107346.

Almost surely, 2^138281256 is an apocalyptic number.

It is an amenable number.

138281256 is an abundant number, since it is smaller than the sum of its proper divisors (249036114).

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

138281256 is a wasteful number, since it uses less digits than its factorization.

138281256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213415 (or 213402 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 138281256 is about 11759.3050815089. The cubic root of 138281256 is about 517.1157576198.

The spelling of 138281256 in words is "one hundred thirty-eight million, two hundred eighty-one thousand, two hundred fifty-six".