2115999 has 6 divisors (see below), whose sum is σ = 3056456. Its totient is φ = 1410660.

The previous prime is 2115983. The next prime is 2116019. The reversal of 2115999 is 9995112.

It is not a de Polignac number, because 2115999 - 2⁴ = 2115983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117547 + ... + 117564.

2^2115999 is an apocalyptic number.

2115999 is a deficient number, since it is larger than the sum of its proper divisors (940457).

2115999 is a wasteful number, since it uses less digits than its factorization.

2115999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235117 (or 235114 counting only the distinct ones).

The product of its digits is 7290, while the sum is 36.

The square root of 2115999 is about 1454.6473799516. The cubic root of 2115999 is about 128.3823002359.

The spelling of 2115999 in words is "two million, one hundred fifteen thousand, nine hundred ninety-nine".