2099987 has 4 divisors (see below), whose sum is σ = 2135640. Its totient is φ = 2064336.

The previous prime is 2099963. The next prime is 2100001. The reversal of 2099987 is 7899902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2099987 - 2⁸ = 2099731 is a prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 20 and 99987 contains 2099987 itself.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2099927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17738 + ... + 17855.

It is an arithmetic number, because the mean of its divisors is an integer number (533910).

2^2099987 is an apocalyptic number.

2099987 is a deficient number, since it is larger than the sum of its proper divisors (35653).

2099987 is an equidigital number, since it uses as much as digits as its factorization.

2099987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35652.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 2099987 is about 1449.1331891859. The cubic root of 2099987 is about 128.0576522517.

The spelling of 2099987 in words is "two million, ninety-nine thousand, nine hundred eighty-seven".