404400253 has 2 divisors, whose sum is σ = 404400254. Its totient is φ = 404400252.

The previous prime is 404400223. The next prime is 404400257. The reversal of 404400253 is 352004404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220879044 + 183521209 = 14862^2 + 13547^2 .

It is a cyclic number.

It is not a de Polignac number, because 404400253 - 2²¹ = 402303101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404400257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202200126 + 202200127.

It is an arithmetic number, because the mean of its divisors is an integer number (202200127).

Almost surely, 2^404400253 is an apocalyptic number.

It is an amenable number.

404400253 is a deficient number, since it is larger than the sum of its proper divisors (1).

404400253 is an equidigital number, since it uses as much as digits as its factorization.

404400253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 404400253 is about 20109.7054428950. The cubic root of 404400253 is about 739.4982311862.

Adding to 404400253 its reverse (352004404), we get a palindrome (756404657).

The spelling of 404400253 in words is "four hundred four million, four hundred thousand, two hundred fifty-three".