393221497 has 2 divisors, whose sum is σ = 393221498. Its totient is φ = 393221496.

The previous prime is 393221471. The next prime is 393221503. The reversal of 393221497 is 794122393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348344896 + 44876601 = 18664^2 + 6699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393221497 is a prime.

It is not a weakly prime, because it can be changed into another prime (393221417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196610748 + 196610749.

It is an arithmetic number, because the mean of its divisors is an integer number (196610749).

Almost surely, 2^393221497 is an apocalyptic number.

It is an amenable number.

393221497 is a deficient number, since it is larger than the sum of its proper divisors (1).

393221497 is an equidigital number, since it uses as much as digits as its factorization.

393221497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 393221497 is about 19829.8133374977. The cubic root of 393221497 is about 732.6205291148.

The spelling of 393221497 in words is "three hundred ninety-three million, two hundred twenty-one thousand, four hundred ninety-seven".