399760087 has 2 divisors, whose sum is σ = 399760088. Its totient is φ = 399760086.

The previous prime is 399760073. The next prime is 399760103. The reversal of 399760087 is 780067993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399760087 - 2¹¹ = 399758039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399760087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399760037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199880043 + 199880044.

It is an arithmetic number, because the mean of its divisors is an integer number (199880044).

Almost surely, 2^399760087 is an apocalyptic number.

399760087 is a deficient number, since it is larger than the sum of its proper divisors (1).

399760087 is an equidigital number, since it uses as much as digits as its factorization.

399760087 is an evil number, because the sum of its binary digits is even.

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

The square root of 399760087 is about 19994.0012753826. The cubic root of 399760087 is about 736.6589624259.

The spelling of 399760087 in words is "three hundred ninety-nine million, seven hundred sixty thousand, eighty-seven".