138747776 has 32 divisors (see below), whose sum is σ = 288435600. Its totient is φ = 66356224.

The previous prime is 138747769. The next prime is 138747781. The reversal of 138747776 is 677747831.

It is a tau number, because it is divible by the number of its divisors (32).

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, 20621 + ... + 26508.

Almost surely, 2^138747776 is an apocalyptic number.

138747776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138747776 is an abundant number, since it is smaller than the sum of its proper divisors (149687824).

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

138747776 is an equidigital number, since it uses as much as digits as its factorization.

138747776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47166 (or 47154 counting only the distinct ones).

The product of its digits is 1382976, while the sum is 50.

The square root of 138747776 is about 11779.1245854690. The cubic root of 138747776 is about 517.6966366711.

The spelling of 138747776 in words is "one hundred thirty-eight million, seven hundred forty-seven thousand, seven hundred seventy-six".