138992560 has 40 divisors (see below), whose sum is σ = 369324576. Its totient is φ = 47654400.

The previous prime is 138992551. The next prime is 138992573. The reversal of 138992560 is 65299831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×138992560³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123541 + ... + 124660.

Almost surely, 2^138992560 is an apocalyptic number.

138992560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138992560 is an abundant number, since it is smaller than the sum of its proper divisors (230332016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138992560 is a wasteful number, since it uses less digits than its factorization.

138992560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248221 (or 248215 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 138992560 is about 11789.5105920475. The cubic root of 138992560 is about 518.0009043777. Note that the first 3 decimals are identical.

The spelling of 138992560 in words is "one hundred thirty-eight million, nine hundred ninety-two thousand, five hundred sixty".