404721851 has 2 divisors, whose sum is σ = 404721852. Its totient is φ = 404721850.

The previous prime is 404721803. The next prime is 404721853. The reversal of 404721851 is 158127404.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404721851 - 2²⁶ = 337612987 is a prime.

It is a Sophie Germain prime.

Together with 404721853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404721853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202360925 + 202360926.

It is an arithmetic number, because the mean of its divisors is an integer number (202360926).

Almost surely, 2^404721851 is an apocalyptic number.

404721851 is a deficient number, since it is larger than the sum of its proper divisors (1).

404721851 is an equidigital number, since it uses as much as digits as its factorization.

404721851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 404721851 is about 20117.6999430849. The cubic root of 404721851 is about 739.6942071086.

The spelling of 404721851 in words is "four hundred four million, seven hundred twenty-one thousand, eight hundred fifty-one".