139399520 has 96 divisors (see below), whose sum is σ = 367053120. Its totient is φ = 49674240.

The previous prime is 139399517. The next prime is 139399531. The reversal of 139399520 is 25993931.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59165 + ... + 61475.

It is an arithmetic number, because the mean of its divisors is an integer number (3823470).

Almost surely, 2^139399520 is an apocalyptic number.

139399520 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 139399520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183526560).

139399520 is an abundant number, since it is smaller than the sum of its proper divisors (227653600).

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

139399520 is a wasteful number, since it uses less digits than its factorization.

139399520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368 (or 2360 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 139399520 is about 11806.7573871915. The cubic root of 139399520 is about 518.5059679603.

The spelling of 139399520 in words is "one hundred thirty-nine million, three hundred ninety-nine thousand, five hundred twenty".