139390720 has 144 divisors (see below), whose sum is σ = 390878208. Its totient is φ = 46632960.

The previous prime is 139390717. The next prime is 139390739. The reversal of 139390720 is 27093931.

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, 420955 + ... + 421285.

It is an arithmetic number, because the mean of its divisors is an integer number (2714432).

Almost surely, 2^139390720 is an apocalyptic number.

139390720 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 139390720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195439104).

139390720 is an abundant number, since it is smaller than the sum of its proper divisors (251487488).

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

139390720 is an equidigital number, since it uses as much as digits as its factorization.

139390720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 139390720 is about 11806.3847133659. The cubic root of 139390720 is about 518.4950569984.

The spelling of 139390720 in words is "one hundred thirty-nine million, three hundred ninety thousand, seven hundred twenty".