139005720 has 256 divisors, whose sum is σ = 538444800. Its totient is φ = 31632768.

The previous prime is 139005701. The next prime is 139005731. The reversal of 139005720 is 27500931.

139005720 is a `hidden beast` number, since 1 + 3 + 90 + 0 + 572 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 612247 + ... + 612473.

It is an arithmetic number, because the mean of its divisors is an integer number (2103300).

Almost surely, 2^139005720 is an apocalyptic number.

139005720 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 139005720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269222400).

139005720 is an abundant number, since it is smaller than the sum of its proper divisors (399439080).

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

139005720 is an equidigital number, since it uses as much as digits as its factorization.

139005720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 139005720 is about 11790.0687020899. The cubic root of 139005720 is about 518.0172521994.

The spelling of 139005720 in words is "one hundred thirty-nine million, five thousand, seven hundred twenty".