399366287 has 2 divisors, whose sum is σ = 399366288. Its totient is φ = 399366286.

The previous prime is 399366269. The next prime is 399366307. The reversal of 399366287 is 782663993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399366287 - 2⁸ = 399366031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399366257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199683143 + 199683144.

It is an arithmetic number, because the mean of its divisors is an integer number (199683144).

Almost surely, 2^399366287 is an apocalyptic number.

399366287 is a deficient number, since it is larger than the sum of its proper divisors (1).

399366287 is an equidigital number, since it uses as much as digits as its factorization.

399366287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 53.

The square root of 399366287 is about 19984.1508951469. The cubic root of 399366287 is about 736.4169909551.

The spelling of 399366287 in words is "three hundred ninety-nine million, three hundred sixty-six thousand, two hundred eighty-seven".