239240639 has 4 divisors (see below), whose sum is σ = 260989800. Its totient is φ = 217491480.

The previous prime is 239240629. The next prime is 239240707. The reversal of 239240639 is 936042932.

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 239240639 - 2⁸ = 239240383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239240629) 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, 10874564 + ... + 10874585.

It is an arithmetic number, because the mean of its divisors is an integer number (65247450).

Almost surely, 2^239240639 is an apocalyptic number.

239240639 is a deficient number, since it is larger than the sum of its proper divisors (21749161).

239240639 is a wasteful number, since it uses less digits than its factorization.

239240639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21749160.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 239240639 is about 15467.4056971426. The cubic root of 239240639 is about 620.7903889498.

The spelling of 239240639 in words is "two hundred thirty-nine million, two hundred forty thousand, six hundred thirty-nine".