138155900 has 18 divisors (see below), whose sum is σ = 299798520. Its totient is φ = 55262320.

The previous prime is 138155873. The next prime is 138155977. The reversal of 138155900 is 9551831.

138155900 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 690680 + ... + 690879.

Almost surely, 2^138155900 is an apocalyptic number.

138155900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138155900 is an abundant number, since it is smaller than the sum of its proper divisors (161642620).

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

138155900 is a wasteful number, since it uses less digits than its factorization.

138155900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381573 (or 1381566 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 138155900 is about 11753.9737961253. The cubic root of 138155900 is about 516.9594501953.

The spelling of 138155900 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, nine hundred".