139521320 has 32 divisors (see below), whose sum is σ = 324750600. Its totient is φ = 53883648.

The previous prime is 139521307. The next prime is 139521337. The reversal of 139521320 is 23125931.

139521320 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 82337476 + 57183844 = 9074^2 + 7562^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139521320.

It is an unprimeable number.

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, 58979 + ... + 61298.

Almost surely, 2^139521320 is an apocalyptic number.

139521320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139521320 is an abundant number, since it is smaller than the sum of its proper divisors (185229280).

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

139521320 is a wasteful number, since it uses less digits than its factorization.

139521320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120317 (or 120313 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 139521320 is about 11811.9143241051. The cubic root of 139521320 is about 518.6569384520.

The spelling of 139521320 in words is "one hundred thirty-nine million, five hundred twenty-one thousand, three hundred twenty".