399051287 has 2 divisors, whose sum is σ = 399051288. Its totient is φ = 399051286.

The previous prime is 399051259. The next prime is 399051293. The reversal of 399051287 is 782150993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399051287 - 2¹⁸ = 398789143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399051227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199525643 + 199525644.

It is an arithmetic number, because the mean of its divisors is an integer number (199525644).

Almost surely, 2^399051287 is an apocalyptic number.

399051287 is a deficient number, since it is larger than the sum of its proper divisors (1).

399051287 is an equidigital number, since it uses as much as digits as its factorization.

399051287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 399051287 is about 19976.2680949170. The cubic root of 399051287 is about 736.2233238250.

The spelling of 399051287 in words is "three hundred ninety-nine million, fifty-one thousand, two hundred eighty-seven".