239986221 has 8 divisors (see below), whose sum is σ = 330303744. Its totient is φ = 154829760.

The previous prime is 239986151. The next prime is 239986231. The reversal of 239986221 is 122689932.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 239986221 - 2¹⁸ = 239724077 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239986231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1290156 + ... + 1290341.

It is an arithmetic number, because the mean of its divisors is an integer number (41287968).

Almost surely, 2^239986221 is an apocalyptic number.

It is an amenable number.

239986221 is a deficient number, since it is larger than the sum of its proper divisors (90317523).

239986221 is a wasteful number, since it uses less digits than its factorization.

239986221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580531.

The product of its digits is 93312, while the sum is 42.

The square root of 239986221 is about 15491.4886631337. The cubic root of 239986221 is about 621.4346080307.

The spelling of 239986221 in words is "two hundred thirty-nine million, nine hundred eighty-six thousand, two hundred twenty-one".