404993291 has 2 divisors, whose sum is σ = 404993292. Its totient is φ = 404993290.

The previous prime is 404993273. The next prime is 404993317. The reversal of 404993291 is 192399404.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404993291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404993201) 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, 202496645 + 202496646.

It is an arithmetic number, because the mean of its divisors is an integer number (202496646).

Almost surely, 2^404993291 is an apocalyptic number.

404993291 is a deficient number, since it is larger than the sum of its proper divisors (1).

404993291 is an equidigital number, since it uses as much as digits as its factorization.

404993291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 404993291 is about 20124.4451103627. The cubic root of 404993291 is about 739.8595368897.

The spelling of 404993291 in words is "four hundred four million, nine hundred ninety-three thousand, two hundred ninety-one".