239644421 has 4 divisors (see below), whose sum is σ = 240136992. Its totient is φ = 239151852.

The previous prime is 239644403. The next prime is 239644423. The reversal of 239644421 is 124446932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239644421 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 (239644423) 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 3 ways as a sum of consecutive naturals, for example, 245555 + ... + 246528.

It is an arithmetic number, because the mean of its divisors is an integer number (60034248).

Almost surely, 2^239644421 is an apocalyptic number.

It is an amenable number.

239644421 is a deficient number, since it is larger than the sum of its proper divisors (492571).

239644421 is an equidigital number, since it uses as much as digits as its factorization.

239644421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492570.

The product of its digits is 41472, while the sum is 35.

The square root of 239644421 is about 15480.4528680527. The cubic root of 239644421 is about 621.1394421002.

The spelling of 239644421 in words is "two hundred thirty-nine million, six hundred forty-four thousand, four hundred twenty-one".