138904782 has 16 divisors (see below), whose sum is σ = 292431360. Its totient is φ = 43864632.

The previous prime is 138904757. The next prime is 138904783. The reversal of 138904782 is 287409831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138904783) 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, 609118 + ... + 609345.

It is an arithmetic number, because the mean of its divisors is an integer number (18276960).

Almost surely, 2^138904782 is an apocalyptic number.

138904782 is an abundant number, since it is smaller than the sum of its proper divisors (153526578).

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

138904782 is a wasteful number, since it uses less digits than its factorization.

138904782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218487.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 138904782 is about 11785.7872880856. The cubic root of 138904782 is about 517.8918370088.

The spelling of 138904782 in words is "one hundred thirty-eight million, nine hundred four thousand, seven hundred eighty-two".