239972539 has 2 divisors, whose sum is σ = 239972540. Its totient is φ = 239972538.

The previous prime is 239972531. The next prime is 239972543. The reversal of 239972539 is 935279932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 239972539 - 2³ = 239972531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 239972492 and 239972501.

It is not a weakly prime, because it can be changed into another prime (239972531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119986269 + 119986270.

It is an arithmetic number, because the mean of its divisors is an integer number (119986270).

Almost surely, 2^239972539 is an apocalyptic number.

239972539 is a deficient number, since it is larger than the sum of its proper divisors (1).

239972539 is an equidigital number, since it uses as much as digits as its factorization.

239972539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 49.

The square root of 239972539 is about 15491.0470595115. The cubic root of 239972539 is about 621.4227981445.

The spelling of 239972539 in words is "two hundred thirty-nine million, nine hundred seventy-two thousand, five hundred thirty-nine".