139517856 has 96 divisors (see below), whose sum is σ = 420134400. Its totient is φ = 44997120.

The previous prime is 139517821. The next prime is 139517857. The reversal of 139517856 is 658715931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139517857) 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, 24180 + ... + 29388.

It is an arithmetic number, because the mean of its divisors is an integer number (4376400).

Almost surely, 2^139517856 is an apocalyptic number.

139517856 is a gapful number since it is divisible by the number (16) 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 139517856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210067200).

139517856 is an abundant number, since it is smaller than the sum of its proper divisors (280616544).

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

139517856 is a wasteful number, since it uses less digits than its factorization.

139517856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259 (or 5245 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 139517856 is about 11811.7676915862. The cubic root of 139517856 is about 518.6526460555.

The spelling of 139517856 in words is "one hundred thirty-nine million, five hundred seventeen thousand, eight hundred fifty-six".