404253991 has 2 divisors, whose sum is σ = 404253992. Its totient is φ = 404253990.

The previous prime is 404253989. The next prime is 404254009. The reversal of 404253991 is 199352404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404253991 - 2¹ = 404253989 is a prime.

Together with 404253989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 404253991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404253961) 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 as a sum of consecutive naturals, namely, 202126995 + 202126996.

It is an arithmetic number, because the mean of its divisors is an integer number (202126996).

Almost surely, 2^404253991 is an apocalyptic number.

404253991 is a deficient number, since it is larger than the sum of its proper divisors (1).

404253991 is an equidigital number, since it uses as much as digits as its factorization.

404253991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 404253991 is about 20106.0685117703. The cubic root of 404253991 is about 739.4090674333.

The spelling of 404253991 in words is "four hundred four million, two hundred fifty-three thousand, nine hundred ninety-one".