139131720 has 384 divisors, whose sum is σ = 578672640. Its totient is φ = 28200960.

The previous prime is 139131709. The next prime is 139131743. The reversal of 139131720 is 27131931.

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 95 ways as a sum of consecutive naturals, for example, 1015492 + ... + 1015628.

It is an arithmetic number, because the mean of its divisors is an integer number (1506960).

Almost surely, 2^139131720 is an apocalyptic number.

139131720 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 139131720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289336320).

139131720 is an abundant number, since it is smaller than the sum of its proper divisors (439540920).

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

139131720 is a wasteful number, since it uses less digits than its factorization.

139131720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 139131720 is about 11795.4109720688. The cubic root of 139131720 is about 518.1737216900.

The spelling of 139131720 in words is "one hundred thirty-nine million, one hundred thirty-one thousand, seven hundred twenty".