239887921 has 16 divisors (see below), whose sum is σ = 295907584. Its totient is φ = 189376704.

The previous prime is 239887919. The next prime is 239887931. The reversal of 239887921 is 129788932.

It is a cyclic number.

It is not a de Polignac number, because 239887921 - 2¹ = 239887919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (239887931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41611 + ... + 47023.

It is an arithmetic number, because the mean of its divisors is an integer number (18494224).

Almost surely, 2^239887921 is an apocalyptic number.

It is an amenable number.

239887921 is a deficient number, since it is larger than the sum of its proper divisors (56019663).

239887921 is a wasteful number, since it uses less digits than its factorization.

239887921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5920.

The product of its digits is 435456, while the sum is 49.

The square root of 239887921 is about 15488.3156282405. The cubic root of 239887921 is about 621.3497484859.

The spelling of 239887921 in words is "two hundred thirty-nine million, eight hundred eighty-seven thousand, nine hundred twenty-one".