222438257 has 4 divisors (see below), whose sum is σ = 225118320. Its totient is φ = 219758196.

The previous prime is 222438247. The next prime is 222438277. The reversal of 222438257 is 752834222.

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 not a de Polignac number, because 222438257 - 2⁸ = 222438001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222438247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1339907 + ... + 1340072.

It is an arithmetic number, because the mean of its divisors is an integer number (56279580).

Almost surely, 2^222438257 is an apocalyptic number.

It is an amenable number.

222438257 is a deficient number, since it is larger than the sum of its proper divisors (2680063).

222438257 is an equidigital number, since it uses as much as digits as its factorization.

222438257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680062.

The product of its digits is 53760, while the sum is 35.

The square root of 222438257 is about 14914.3641165153. The cubic root of 222438257 is about 605.9030813283.

The spelling of 222438257 in words is "two hundred twenty-two million, four hundred thirty-eight thousand, two hundred fifty-seven".