138780912 has 40 divisors (see below), whose sum is σ = 359976960. Its totient is φ = 46072000.

The previous prime is 138780869. The next prime is 138780913. The reversal of 138780912 is 219087831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138780913) 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, 6289 + ... + 17807.

It is an arithmetic number, because the mean of its divisors is an integer number (8999424).

Almost surely, 2^138780912 is an apocalyptic number.

138780912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138780912 is an abundant number, since it is smaller than the sum of its proper divisors (221196048).

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

138780912 is a wasteful number, since it uses less digits than its factorization.

138780912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11781 (or 11775 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 138780912 is about 11780.5310576391. The cubic root of 138780912 is about 517.7378458128.

The spelling of 138780912 in words is "one hundred thirty-eight million, seven hundred eighty thousand, nine hundred twelve".