239995009 has 2 divisors, whose sum is σ = 239995010. Its totient is φ = 239995008.

The previous prime is 239994973. The next prime is 239995051. The reversal of 239995009 is 900599932.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172344384 + 67650625 = 13128^2 + 8225^2 .

It is a cyclic number.

It is not a de Polignac number, because 239995009 - 2⁹ = 239994497 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 239995009.

It is not a weakly prime, because it can be changed into another prime (239915009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119997504 + 119997505.

It is an arithmetic number, because the mean of its divisors is an integer number (119997505).

Almost surely, 2^239995009 is an apocalyptic number.

It is an amenable number.

239995009 is a deficient number, since it is larger than the sum of its proper divisors (1).

239995009 is an equidigital number, since it uses as much as digits as its factorization.

239995009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196830, while the sum is 46.

The square root of 239995009 is about 15491.7723001598. The cubic root of 239995009 is about 621.4421933283.

The spelling of 239995009 in words is "two hundred thirty-nine million, nine hundred ninety-five thousand, nine".