138078732 has 24 divisors (see below), whose sum is σ = 351473472. Its totient is φ = 41842000.

The previous prime is 138078667. The next prime is 138078751. The reversal of 138078732 is 237870831.

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, 522894 + ... + 523157.

It is an arithmetic number, because the mean of its divisors is an integer number (14644728).

Almost surely, 2^138078732 is an apocalyptic number.

138078732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138078732 is an abundant number, since it is smaller than the sum of its proper divisors (213394740).

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

138078732 is a wasteful number, since it uses less digits than its factorization.

138078732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046069 (or 1046067 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 138078732 is about 11750.6907031034. The cubic root of 138078732 is about 516.8631817609.

The spelling of 138078732 in words is "one hundred thirty-eight million, seventy-eight thousand, seven hundred thirty-two".