138125357 has 4 divisors (see below), whose sum is σ = 146250396. Its totient is φ = 130000320.

The previous prime is 138125353. The next prime is 138125359. The reversal of 138125357 is 753521831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72012196 + 66113161 = 8486^2 + 8131^2 .

It is a cyclic number.

It is not a de Polignac number, because 138125357 - 2² = 138125353 is a prime.

It is a super-2 number, since 2×138125357² = 38157228492754898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138125353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4062494 + ... + 4062527.

It is an arithmetic number, because the mean of its divisors is an integer number (36562599).

Almost surely, 2^138125357 is an apocalyptic number.

138125357 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138125357 is a deficient number, since it is larger than the sum of its proper divisors (8125039).

138125357 is an equidigital number, since it uses as much as digits as its factorization.

138125357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8125038.

The product of its digits is 25200, while the sum is 35.

The square root of 138125357 is about 11752.6744615853. The cubic root of 138125357 is about 516.9213515541.

The spelling of 138125357 in words is "one hundred thirty-eight million, one hundred twenty-five thousand, three hundred fifty-seven".