138993900 has 36 divisors (see below), whose sum is σ = 402156552. Its totient is φ = 37064960.

The previous prime is 138993889. The next prime is 138993901. The reversal of 138993900 is 9399831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138993901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231357 + ... + 231956.

Almost surely, 2^138993900 is an apocalyptic number.

138993900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138993900 is an abundant number, since it is smaller than the sum of its proper divisors (263162652).

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

138993900 is a wasteful number, since it uses less digits than its factorization.

138993900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463330 (or 463323 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 138993900 is about 11789.5674220898. The cubic root of 138993900 is about 518.0025690207.

The spelling of 138993900 in words is "one hundred thirty-eight million, nine hundred ninety-three thousand, nine hundred".