239242921 has 4 divisors (see below), whose sum is σ = 253316052. Its totient is φ = 225169792.

The previous prime is 239242891. The next prime is 239242937. The reversal of 239242921 is 129242932.

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 169937296 + 69305625 = 13036^2 + 8325^2 .

It is a cyclic number.

It is not a de Polignac number, because 239242921 - 2¹³ = 239234729 is a prime.

It is a super-2 number, since 2×239242921² = 114474350497224482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239242321) 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, 7036540 + ... + 7036573.

It is an arithmetic number, because the mean of its divisors is an integer number (63329013).

Almost surely, 2^239242921 is an apocalyptic number.

It is an amenable number.

239242921 is a deficient number, since it is larger than the sum of its proper divisors (14073131).

239242921 is a wasteful number, since it uses less digits than its factorization.

239242921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14073130.

The product of its digits is 15552, while the sum is 34.

The square root of 239242921 is about 15467.4794649936. The cubic root of 239242921 is about 620.7923627493.

The spelling of 239242921 in words is "two hundred thirty-nine million, two hundred forty-two thousand, nine hundred twenty-one".