138125992 has 8 divisors (see below), whose sum is σ = 258986250. Its totient is φ = 69062992.

The previous prime is 138125989. The next prime is 138125993. The reversal of 138125992 is 299521831.

It can be written as a sum of positive squares in only one way, i.e., 84162276 + 53963716 = 9174^2 + 7346^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138125993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8632867 + ... + 8632882.

Almost surely, 2^138125992 is an apocalyptic number.

It is an amenable number.

138125992 is a deficient number, since it is larger than the sum of its proper divisors (120860258).

138125992 is a wasteful number, since it uses less digits than its factorization.

138125992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17265755 (or 17265751 counting only the distinct ones).

The product of its digits is 38880, while the sum is 40.

The square root of 138125992 is about 11752.7014766819. The cubic root of 138125992 is about 516.9221436958.

The spelling of 138125992 in words is "one hundred thirty-eight million, one hundred twenty-five thousand, nine hundred ninety-two".