393187297 has 2 divisors, whose sum is σ = 393187298. Its totient is φ = 393187296.

The previous prime is 393187261. The next prime is 393187303. The reversal of 393187297 is 792781393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232379536 + 160807761 = 15244^2 + 12681^2 .

It is a cyclic number.

It is not a de Polignac number, because 393187297 - 2¹⁹ = 392663009 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 393187297.

It is not a weakly prime, because it can be changed into another prime (393187247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196593648 + 196593649.

It is an arithmetic number, because the mean of its divisors is an integer number (196593649).

Almost surely, 2^393187297 is an apocalyptic number.

It is an amenable number.

393187297 is a deficient number, since it is larger than the sum of its proper divisors (1).

393187297 is an equidigital number, since it uses as much as digits as its factorization.

393187297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 49.

The square root of 393187297 is about 19828.9509808260. The cubic root of 393187297 is about 732.5992888819.

The spelling of 393187297 in words is "three hundred ninety-three million, one hundred eighty-seven thousand, two hundred ninety-seven".