139424539 has 4 divisors (see below), whose sum is σ = 139464280. Its totient is φ = 139384800.

The previous prime is 139424507. The next prime is 139424543. The reversal of 139424539 is 935424931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139424539 - 2⁵ = 139424507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139424569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14037 + ... + 21814.

It is an arithmetic number, because the mean of its divisors is an integer number (34866070).

Almost surely, 2^139424539 is an apocalyptic number.

139424539 is a deficient number, since it is larger than the sum of its proper divisors (39741).

139424539 is an equidigital number, since it uses as much as digits as its factorization.

139424539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39740.

The product of its digits is 116640, while the sum is 40.

The square root of 139424539 is about 11807.8168600296. The cubic root of 139424539 is about 518.5369860604.

It can be divided in two parts, 13942 and 4539, that added together give a palindrome (18481).

The spelling of 139424539 in words is "one hundred thirty-nine million, four hundred twenty-four thousand, five hundred thirty-nine".