2687999 has 2 divisors, whose sum is σ = 2688000. Its totient is φ = 2687998.

The previous prime is 2687983. The next prime is 2688017. The reversal of 2687999 is 9997862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2687999 - 2⁴ = 2687983 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2687969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343999 + 1344000.

It is an arithmetic number, because the mean of its divisors is an integer number (1344000).

2^2687999 is an apocalyptic number.

2687999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687999 is an equidigital number, since it uses as much as digits as its factorization.

2687999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 2687999 is about 1639.5118175847. The cubic root of 2687999 is about 139.0410485533.

The spelling of 2687999 in words is "two million, six hundred eighty-seven thousand, nine hundred ninety-nine".