404274721 has 2 divisors, whose sum is σ = 404274722. Its totient is φ = 404274720.

The previous prime is 404274713. The next prime is 404274727. The reversal of 404274721 is 127472404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372914721 + 31360000 = 19311^2 + 5600^2 .

It is a cyclic number.

It is not a de Polignac number, because 404274721 - 2³ = 404274713 is a prime.

It is not a weakly prime, because it can be changed into another prime (404274727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202137360 + 202137361.

It is an arithmetic number, because the mean of its divisors is an integer number (202137361).

Almost surely, 2^404274721 is an apocalyptic number.

It is an amenable number.

404274721 is a deficient number, since it is larger than the sum of its proper divisors (1).

404274721 is an equidigital number, since it uses as much as digits as its factorization.

404274721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 31.

The square root of 404274721 is about 20106.5840211608. The cubic root of 404274721 is about 739.4217060948.

The spelling of 404274721 in words is "four hundred four million, two hundred seventy-four thousand, seven hundred twenty-one".