399977287 has 2 divisors, whose sum is σ = 399977288. Its totient is φ = 399977286.

The previous prime is 399977267. The next prime is 399977317. The reversal of 399977287 is 782779993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399977287 - 2¹¹ = 399975239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399977257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199988643 + 199988644.

It is an arithmetic number, because the mean of its divisors is an integer number (199988644).

Almost surely, 2^399977287 is an apocalyptic number.

399977287 is a deficient number, since it is larger than the sum of its proper divisors (1).

399977287 is an equidigital number, since it uses as much as digits as its factorization.

399977287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12002256, while the sum is 61.

The square root of 399977287 is about 19999.4321669391. The cubic root of 399977287 is about 736.7923535629.

The spelling of 399977287 in words is "three hundred ninety-nine million, nine hundred seventy-seven thousand, two hundred eighty-seven".