22457 has 4 divisors (see below), whose sum is σ = 23796. Its totient is φ = 21120.

The previous prime is 22453. The next prime is 22469. The reversal of 22457 is 75422.

22457 = T₁₈ + T₁₉ + ... + T₅₁.

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 19321 + 3136 = 139^2 + 56^2 .

It is a cyclic number.

It is not a de Polignac number, because 22457 - 2² = 22453 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (22453) 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, 644 + ... + 677.

It is an arithmetic number, because the mean of its divisors is an integer number (5949).

2²²⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

22457 is a deficient number, since it is larger than the sum of its proper divisors (1339).

22457 is a wasteful number, since it uses less digits than its factorization.

22457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338.

The product of its digits is 560, while the sum is 20.

The square root of 22457 is about 149.8565981197. The cubic root of 22457 is about 28.2130851535.

Adding to 22457 its reverse (75422), we get a palindrome (97879).

The spelling of 22457 in words is "twenty-two thousand, four hundred fifty-seven".