139385520 has 240 divisors, whose sum is σ = 515324160. Its totient is φ = 33606144.

The previous prime is 139385507. The next prime is 139385537. The reversal of 139385520 is 25583931.

139385520 is a `hidden beast` number, since 13 + 93 + 8 + 552 + 0 = 666.

139385520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314419 + ... + 314861.

It is an arithmetic number, because the mean of its divisors is an integer number (2147184).

Almost surely, 2^139385520 is an apocalyptic number.

139385520 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 139385520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257662080).

139385520 is an abundant number, since it is smaller than the sum of its proper divisors (375938640).

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

139385520 is a wasteful number, since it uses less digits than its factorization.

139385520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 139385520 is about 11806.1644914849. The cubic root of 139385520 is about 518.4886093960.

The spelling of 139385520 in words is "one hundred thirty-nine million, three hundred eighty-five thousand, five hundred twenty".