404745221 has 2 divisors, whose sum is σ = 404745222. Its totient is φ = 404745220.

The previous prime is 404745217. The next prime is 404745233. The reversal of 404745221 is 122547404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404572996 + 172225 = 20114^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 404745221 - 2² = 404745217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404745241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202372610 + 202372611.

It is an arithmetic number, because the mean of its divisors is an integer number (202372611).

Almost surely, 2^404745221 is an apocalyptic number.

It is an amenable number.

404745221 is a deficient number, since it is larger than the sum of its proper divisors (1).

404745221 is an equidigital number, since it uses as much as digits as its factorization.

404745221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 404745221 is about 20118.2807665069. The cubic root of 404745221 is about 739.7084443111.

The spelling of 404745221 in words is "four hundred four million, seven hundred forty-five thousand, two hundred twenty-one".