239390639 has 4 divisors (see below), whose sum is σ = 239426880. Its totient is φ = 239354400.

The previous prime is 239390597. The next prime is 239390663. The reversal of 239390639 is 936093932.

It is a happy number.

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 239390639 - 2⁸ = 239390383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 239390639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239390689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5087 + ... + 22464.

It is an arithmetic number, because the mean of its divisors is an integer number (59856720).

Almost surely, 2^239390639 is an apocalyptic number.

239390639 is a deficient number, since it is larger than the sum of its proper divisors (36241).

239390639 is an equidigital number, since it uses as much as digits as its factorization.

239390639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36240.

The product of its (nonzero) digits is 236196, while the sum is 44.

The square root of 239390639 is about 15472.2538435743. The cubic root of 239390639 is about 620.9201036786.

The spelling of 239390639 in words is "two hundred thirty-nine million, three hundred ninety thousand, six hundred thirty-nine".