139401520 has 40 divisors (see below), whose sum is σ = 324956880. Its totient is φ = 55614720.

The previous prime is 139401503. The next prime is 139401527. The reversal of 139401520 is 25104931.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (139401527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31611 + ... + 35749.

It is an arithmetic number, because the mean of its divisors is an integer number (8123922).

Almost surely, 2^139401520 is an apocalyptic number.

139401520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139401520 is an abundant number, since it is smaller than the sum of its proper divisors (185555360).

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

139401520 is a wasteful number, since it uses less digits than its factorization.

139401520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4573 (or 4567 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 139401520 is about 11806.8420841476. The cubic root of 139401520 is about 518.5084476603.

The spelling of 139401520 in words is "one hundred thirty-nine million, four hundred one thousand, five hundred twenty".