138127725 has 36 divisors (see below), whose sum is σ = 255945300. Its totient is φ = 71124480.

The previous prime is 138127721. The next prime is 138127727. The reversal of 138127725 is 527721831.

138127725 is a `hidden beast` number, since 1 + 381 + 277 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 4447881 + 133679844 = 2109^2 + 11562^2 .

It is not a de Polignac number, because 138127725 - 2² = 138127721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138127725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138127721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4060 + ... + 17109.

Almost surely, 2^138127725 is an apocalyptic number.

138127725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138127725 is a deficient number, since it is larger than the sum of its proper divisors (117817575).

138127725 is a wasteful number, since it uses less digits than its factorization.

138127725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21214 (or 21206 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 138127725 is about 11752.7752041805. The cubic root of 138127725 is about 516.9243055441.

The spelling of 138127725 in words is "one hundred thirty-eight million, one hundred twenty-seven thousand, seven hundred twenty-five".