139638680 has 64 divisors (see below), whose sum is σ = 334873440. Its totient is φ = 52221952.

The previous prime is 139638679. The next prime is 139638691. The reversal of 139638680 is 86836931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117047 + ... + 118233.

Almost surely, 2^139638680 is an apocalyptic number.

139638680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139638680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167436720).

139638680 is an abundant number, since it is smaller than the sum of its proper divisors (195234760).

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

139638680 is a wasteful number, since it uses less digits than its factorization.

139638680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 139638680 is about 11816.8811452092. The cubic root of 139638680 is about 518.8023224913.

The spelling of 139638680 in words is "one hundred thirty-nine million, six hundred thirty-eight thousand, six hundred eighty".