138513964 has 12 divisors (see below), whose sum is σ = 243669888. Its totient is φ = 68894000.

The previous prime is 138513941. The next prime is 138513967. The reversal of 138513964 is 469315831.

It is a super-2 number, since 2×138513964² = 38372236445986592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138513967) 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, 89887 + ... + 91414.

It is an arithmetic number, because the mean of its divisors is an integer number (20305824).

Almost surely, 2^138513964 is an apocalyptic number.

It is an amenable number.

138513964 is a deficient number, since it is larger than the sum of its proper divisors (105155924).

138513964 is a wasteful number, since it uses less digits than its factorization.

138513964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181496 (or 181494 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 138513964 is about 11769.1955544973. The cubic root of 138513964 is about 517.4056728665.

The spelling of 138513964 in words is "one hundred thirty-eight million, five hundred thirteen thousand, nine hundred sixty-four".