139243520 has 104 divisors (see below), whose sum is σ = 360535056. Its totient is φ = 51314688.

The previous prime is 139243513. The next prime is 139243553. The reversal of 139243520 is 25342931.

It is a tau number, because it is divible by the number of its divisors (104).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265979 + ... + 266501.

Almost surely, 2^139243520 is an apocalyptic number.

139243520 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 139243520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180267528).

139243520 is an abundant number, since it is smaller than the sum of its proper divisors (221291536).

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

139243520 is an equidigital number, since it uses as much as digits as its factorization.

139243520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 139243520 is about 11800.1491515997. The cubic root of 139243520 is about 518.3124782388.

The spelling of 139243520 in words is "one hundred thirty-nine million, two hundred forty-three thousand, five hundred twenty".