22238257 has 4 divisors (see below), whose sum is σ = 22294116. Its totient is φ = 22182400.

The previous prime is 22238231. The next prime is 22238269. The reversal of 22238257 is 75283222.

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 10342656 + 11895601 = 3216^2 + 3449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22238257 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22238207) 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, 27328 + ... + 28129.

It is an arithmetic number, because the mean of its divisors is an integer number (5573529).

Almost surely, 2^22238257 is an apocalyptic number.

It is an amenable number.

22238257 is a deficient number, since it is larger than the sum of its proper divisors (55859).

22238257 is an equidigital number, since it uses as much as digits as its factorization.

22238257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55858.

The product of its digits is 13440, while the sum is 31.

The square root of 22238257 is about 4715.7456462367. The cubic root of 22238257 is about 281.2118267862.

The spelling of 22238257 in words is "twenty-two million, two hundred thirty-eight thousand, two hundred fifty-seven".