139399056 has 100 divisors (see below), whose sum is σ = 417486300. Its totient is φ = 44851968.

The previous prime is 139399003. The next prime is 139399079. The reversal of 139399056 is 650993931.

It can be written as a sum of positive squares in 2 ways, for example, as 54464400 + 84934656 = 7380^2 + 9216^2 .

It is a super-2 number, since 2×139399056² = 38864193627382272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35730 + ... + 39438.

It is an arithmetic number, because the mean of its divisors is an integer number (4174863).

Almost surely, 2^139399056 is an apocalyptic number.

139399056 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 139399056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208743150).

139399056 is an abundant number, since it is smaller than the sum of its proper divisors (278087244).

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

139399056 is a wasteful number, since it uses less digits than its factorization.

139399056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758 (or 3743 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 45.

The square root of 139399056 is about 11806.7377374108. The cubic root of 139399056 is about 518.5053926665.

The spelling of 139399056 in words is "one hundred thirty-nine million, three hundred ninety-nine thousand, fifty-six".