22400909 has 2 divisors, whose sum is σ = 22400910. Its totient is φ = 22400908.

The previous prime is 22400899. The next prime is 22400921. The reversal of 22400909 is 90900422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12180100 + 10220809 = 3490^2 + 3197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22400909 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22400929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11200454 + 11200455.

It is an arithmetic number, because the mean of its divisors is an integer number (11200455).

Almost surely, 2^22400909 is an apocalyptic number.

It is an amenable number.

22400909 is a deficient number, since it is larger than the sum of its proper divisors (1).

22400909 is an equidigital number, since it uses as much as digits as its factorization.

22400909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 22400909 is about 4732.9598561577. The cubic root of 22400909 is about 281.8957623230.

The spelling of 22400909 in words is "twenty-two million, four hundred thousand, nine hundred nine".