238633921 has 4 divisors (see below), whose sum is σ = 239235412. Its totient is φ = 238032432.

The previous prime is 238633919. The next prime is 238633987. The reversal of 238633921 is 129336832.

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 185504400 + 53129521 = 13620^2 + 7289^2 .

It is a cyclic number.

It is not a de Polignac number, because 238633921 - 2¹ = 238633919 is a prime.

It is a super-2 number, since 2×238633921² = 113892296503668482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238633121) 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, 300150 + ... + 300943.

It is an arithmetic number, because the mean of its divisors is an integer number (59808853).

Almost surely, 2^238633921 is an apocalyptic number.

It is an amenable number.

238633921 is a deficient number, since it is larger than the sum of its proper divisors (601491).

238633921 is an equidigital number, since it uses as much as digits as its factorization.

238633921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601490.

The product of its digits is 46656, while the sum is 37.

The square root of 238633921 is about 15447.7804554570. The cubic root of 238633921 is about 620.2651666654.

The spelling of 238633921 in words is "two hundred thirty-eight million, six hundred thirty-three thousand, nine hundred twenty-one".