807399221 has 2 divisors, whose sum is σ = 807399222. Its totient is φ = 807399220.

The previous prime is 807399169. The next prime is 807399251. The reversal of 807399221 is 122993708.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 594676996 + 212722225 = 24386^2 + 14585^2 .

It is a cyclic number.

It is not a de Polignac number, because 807399221 - 2¹⁰ = 807398197 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 (807399251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403699610 + 403699611.

It is an arithmetic number, because the mean of its divisors is an integer number (403699611).

Almost surely, 2^807399221 is an apocalyptic number.

It is an amenable number.

807399221 is a deficient number, since it is larger than the sum of its proper divisors (1).

807399221 is an equidigital number, since it uses as much as digits as its factorization.

807399221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 807399221 is about 28414.7711762738. The cubic root of 807399221 is about 931.1709999738.

The spelling of 807399221 in words is "eight hundred seven million, three hundred ninety-nine thousand, two hundred twenty-one".