22256405 has 4 divisors (see below), whose sum is σ = 26707692. Its totient is φ = 17805120.

The previous prime is 22256401. The next prime is 22256411. The reversal of 22256405 is 50465222.

22256405 is nontrivially palindromic in base 4.

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 11771761 + 10484644 = 3431^2 + 3238^2 .

It is not a de Polignac number, because 22256405 - 2² = 22256401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22256401) 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, 2225636 + ... + 2225645.

It is an arithmetic number, because the mean of its divisors is an integer number (6676923).

Almost surely, 2^22256405 is an apocalyptic number.

It is an amenable number.

22256405 is a deficient number, since it is larger than the sum of its proper divisors (4451287).

22256405 is an equidigital number, since it uses as much as digits as its factorization.

22256405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4451286.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 22256405 is about 4717.6694458175. The cubic root of 22256405 is about 281.2883022732.

The spelling of 22256405 in words is "twenty-two million, two hundred fifty-six thousand, four hundred five".