239389917 has 16 divisors (see below), whose sum is σ = 344019648. Its totient is φ = 147196800.

The previous prime is 239389883. The next prime is 239389921. The reversal of 239389917 is 719983932.

It is a happy number.

It is not a de Polignac number, because 239389917 - 2⁷ = 239389789 is a prime.

It is a super-2 number, since 2×239389917² = 114615064722533778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 239389917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239389517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82542 + ... + 85392.

It is an arithmetic number, because the mean of its divisors is an integer number (21501228).

Almost surely, 2^239389917 is an apocalyptic number.

It is an amenable number.

239389917 is a deficient number, since it is larger than the sum of its proper divisors (104629731).

239389917 is a wasteful number, since it uses less digits than its factorization.

239389917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020.

The product of its digits is 734832, while the sum is 51.

The square root of 239389917 is about 15472.2305114680. The cubic root of 239389917 is about 620.9194794482.

The spelling of 239389917 in words is "two hundred thirty-nine million, three hundred eighty-nine thousand, nine hundred seventeen".