239993221 has 4 divisors (see below), whose sum is σ = 258454252. Its totient is φ = 221532192.

The previous prime is 239993207. The next prime is 239993239. The reversal of 239993221 is 122399932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38750625 + 201242596 = 6225^2 + 14186^2 .

It is a cyclic number.

It is not a de Polignac number, because 239993221 - 2¹⁷ = 239862149 is a prime.

It is a super-2 number, since 2×239993221² = 115193492251909682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239993261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9230496 + ... + 9230521.

It is an arithmetic number, because the mean of its divisors is an integer number (64613563).

Almost surely, 2^239993221 is an apocalyptic number.

It is an amenable number.

239993221 is a deficient number, since it is larger than the sum of its proper divisors (18461031).

239993221 is a wasteful number, since it uses less digits than its factorization.

239993221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18461030.

The product of its digits is 52488, while the sum is 40.

The square root of 239993221 is about 15491.7145920005. The cubic root of 239993221 is about 621.4406500442.

The spelling of 239993221 in words is "two hundred thirty-nine million, nine hundred ninety-three thousand, two hundred twenty-one".