138780712 has 128 divisors (see below), whose sum is σ = 335923200. Its totient is φ = 52386048.

The previous prime is 138780709. The next prime is 138780721. The reversal of 138780712 is 217087831.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1296963 + ... + 1297069.

It is an arithmetic number, because the mean of its divisors is an integer number (2624400).

Almost surely, 2^138780712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138780712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167961600).

138780712 is an abundant number, since it is smaller than the sum of its proper divisors (197142488).

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

138780712 is a wasteful number, since it uses less digits than its factorization.

138780712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 138780712 is about 11780.5225690544. The cubic root of 138780712 is about 517.7375971052.

The spelling of 138780712 in words is "one hundred thirty-eight million, seven hundred eighty thousand, seven hundred twelve".