400220657 has 2 divisors, whose sum is σ = 400220658. Its totient is φ = 400220656.

The previous prime is 400220603. The next prime is 400220663. The reversal of 400220657 is 756022004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395572321 + 4648336 = 19889^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 400220657 - 2⁶ = 400220593 is a prime.

It is not a weakly prime, because it can be changed into another prime (400220687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200110328 + 200110329.

It is an arithmetic number, because the mean of its divisors is an integer number (200110329).

Almost surely, 2^400220657 is an apocalyptic number.

It is an amenable number.

400220657 is a deficient number, since it is larger than the sum of its proper divisors (1).

400220657 is an equidigital number, since it uses as much as digits as its factorization.

400220657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 400220657 is about 20005.5156644361. The cubic root of 400220657 is about 736.9417593791.

The spelling of 400220657 in words is "four hundred million, two hundred twenty thousand, six hundred fifty-seven".