138780732 has 12 divisors (see below), whose sum is σ = 323821736. Its totient is φ = 46260240.

The previous prime is 138780727. The next prime is 138780743. The reversal of 138780732 is 237087831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5782519 + ... + 5782542.

Almost surely, 2^138780732 is an apocalyptic number.

138780732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138780732 is an abundant number, since it is smaller than the sum of its proper divisors (185041004).

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

138780732 is a wasteful number, since it uses less digits than its factorization.

138780732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11565068 (or 11565066 counting only the distinct ones).

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

The square root of 138780732 is about 11780.5234179131. The cubic root of 138780732 is about 517.7376219760.

The spelling of 138780732 in words is "one hundred thirty-eight million, seven hundred eighty thousand, seven hundred thirty-two".