22399457 has 4 divisors (see below), whose sum is σ = 22425876. Its totient is φ = 22373040.

The previous prime is 22399441. The next prime is 22399471. The reversal of 22399457 is 75499322.

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 14776336 + 7623121 = 3844^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 22399457 - 2⁴ = 22399441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22399427) 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, 11894 + ... + 13647.

It is an arithmetic number, because the mean of its divisors is an integer number (5606469).

Almost surely, 2^22399457 is an apocalyptic number.

It is an amenable number.

22399457 is a deficient number, since it is larger than the sum of its proper divisors (26419).

22399457 is an equidigital number, since it uses as much as digits as its factorization.

22399457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26418.

The product of its digits is 136080, while the sum is 41.

The square root of 22399457 is about 4732.8064612870. The cubic root of 22399457 is about 281.8896714766.

The spelling of 22399457 in words is "twenty-two million, three hundred ninety-nine thousand, four hundred fifty-seven".