138187960 has 32 divisors (see below), whose sum is σ = 316794240. Its totient is φ = 54231424.

The previous prime is 138187949. The next prime is 138187963. The reversal of 138187960 is 69781831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138187963) 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, 30472 + ... + 34711.

It is an arithmetic number, because the mean of its divisors is an integer number (9899820).

Almost surely, 2^138187960 is an apocalyptic number.

138187960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138187960 is an abundant number, since it is smaller than the sum of its proper divisors (178606280).

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

138187960 is a wasteful number, since it uses less digits than its factorization.

138187960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65247 (or 65243 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 138187960 is about 11755.3375111053. The cubic root of 138187960 is about 516.9994350678. Note that the first 3 decimals are identical.

The spelling of 138187960 in words is "one hundred thirty-eight million, one hundred eighty-seven thousand, nine hundred sixty".