139439520 has 144 divisors (see below), whose sum is σ = 519154272. Its totient is φ = 33799680.

The previous prime is 139439513. The next prime is 139439539. The reversal of 139439520 is 25934931.

It is a happy number.

139439520 is a `hidden beast` number, since 13 + 94 + 39 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 23 ways as a sum of consecutive naturals, for example, 11439 + ... + 20241.

It is an arithmetic number, because the mean of its divisors is an integer number (3605238).

Almost surely, 2^139439520 is an apocalyptic number.

139439520 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 139439520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259577136).

139439520 is an abundant number, since it is smaller than the sum of its proper divisors (379714752).

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

139439520 is a wasteful number, since it uses less digits than its factorization.

139439520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8835 (or 8824 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 139439520 is about 11808.4512108913. The cubic root of 139439520 is about 518.5555574549. Note that the first 5 decimals are identical.

The spelling of 139439520 in words is "one hundred thirty-nine million, four hundred thirty-nine thousand, five hundred twenty".