399887 has 2 divisors, whose sum is σ = 399888. Its totient is φ = 399886.

The previous prime is 399871. The next prime is 399899. The reversal of 399887 is 788993.

It is a strong prime.

It is an emirp because it is prime and its reverse (788993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399887 - 2⁴ = 399871 is a prime.

It is a super-2 number, since 2×399887² = 319819225538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199943 + 199944.

It is an arithmetic number, because the mean of its divisors is an integer number (199944).

2³⁹⁹⁸⁸⁷ is an apocalyptic number.

399887 is a deficient number, since it is larger than the sum of its proper divisors (1).

399887 is an equidigital number, since it uses as much as digits as its factorization.

399887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 399887 is about 632.3661913796. The cubic root of 399887 is about 73.6736910600.

The spelling of 399887 in words is "three hundred ninety-nine thousand, eight hundred eighty-seven".