138749992 has 32 divisors (see below), whose sum is σ = 268092000. Its totient is φ = 67281984.

The previous prime is 138749983. The next prime is 138749993. The reversal of 138749992 is 299947831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138749993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49903 + ... + 52609.

It is an arithmetic number, because the mean of its divisors is an integer number (8377875).

Almost surely, 2^138749992 is an apocalyptic number.

It is an amenable number.

138749992 is a deficient number, since it is larger than the sum of its proper divisors (129342008).

138749992 is a wasteful number, since it uses less digits than its factorization.

138749992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905 (or 2901 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 138749992 is about 11779.2186498087. The cubic root of 138749992 is about 517.6993927744.

The spelling of 138749992 in words is "one hundred thirty-eight million, seven hundred forty-nine thousand, nine hundred ninety-two".