400763221 has 2 divisors, whose sum is σ = 400763222. Its totient is φ = 400763220.

The previous prime is 400763213. The next prime is 400763261. The reversal of 400763221 is 122367004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336539025 + 64224196 = 18345^2 + 8014^2 .

It is a cyclic number.

It is not a de Polignac number, because 400763221 - 2³ = 400763213 is a prime.

It is a super-2 number, since 2×400763221² = 321222318612589682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400763261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200381610 + 200381611.

It is an arithmetic number, because the mean of its divisors is an integer number (200381611).

Almost surely, 2^400763221 is an apocalyptic number.

It is an amenable number.

400763221 is a deficient number, since it is larger than the sum of its proper divisors (1).

400763221 is an equidigital number, since it uses as much as digits as its factorization.

400763221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 400763221 is about 20019.0714320120. The cubic root of 400763221 is about 737.2746236928.

The spelling of 400763221 in words is "four hundred million, seven hundred sixty-three thousand, two hundred twenty-one".