22400405 has 4 divisors (see below), whose sum is σ = 26880492. Its totient is φ = 17920320.

The previous prime is 22400369. The next prime is 22400419. The reversal of 22400405 is 50400422.

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 11792356 + 10608049 = 3434^2 + 3257^2 .

It is not a de Polignac number, because 22400405 - 2⁸ = 22400149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2240036 + ... + 2240045.

It is an arithmetic number, because the mean of its divisors is an integer number (6720123).

Almost surely, 2^22400405 is an apocalyptic number.

It is an amenable number.

22400405 is a deficient number, since it is larger than the sum of its proper divisors (4480087).

22400405 is an equidigital number, since it uses as much as digits as its factorization.

22400405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480086.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 22400405 is about 4732.9066122204. The cubic root of 22400405 is about 281.8936481747.

Adding to 22400405 its sum of digits (17), we get a palindrome (22400422).

Adding to 22400405 its reverse (50400422), we get a palindrome (72800827).

The spelling of 22400405 in words is "twenty-two million, four hundred thousand, four hundred five".