139839720 has 64 divisors (see below), whose sum is σ = 425805120. Its totient is φ = 36731904.

The previous prime is 139839719. The next prime is 139839727. The reversal of 139839720 is 27938931.

It is not an unprimeable number, because it can be changed into a prime (139839727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657 + ... + 16736.

It is an arithmetic number, because the mean of its divisors is an integer number (6653205).

Almost surely, 2^139839720 is an apocalyptic number.

139839720 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 139839720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212902560).

139839720 is an abundant number, since it is smaller than the sum of its proper divisors (285965400).

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

139839720 is a wasteful number, since it uses less digits than its factorization.

139839720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17474 (or 17470 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 139839720 is about 11825.3845603431. The cubic root of 139839720 is about 519.0511790517.

The spelling of 139839720 in words is "one hundred thirty-nine million, eight hundred thirty-nine thousand, seven hundred twenty".