2159999 has 4 divisors (see below), whose sum is σ = 2253936. Its totient is φ = 2066064.

The previous prime is 2159959. The next prime is 2160001. The reversal of 2159999 is 9999512.

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 2159999 - 2²⁰ = 1111423 is a prime.

It is a Duffinian number.

2159999 is a modest number, since divided by 9999 gives 215 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46934 + ... + 46979.

It is an arithmetic number, because the mean of its divisors is an integer number (563484).

2^2159999 is an apocalyptic number.

2159999 is a deficient number, since it is larger than the sum of its proper divisors (93937).

2159999 is an equidigital number, since it uses as much as digits as its factorization.

2159999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93936.

The product of its digits is 65610, while the sum is 44.

The square root of 2159999 is about 1469.6935054630. The cubic root of 2159999 is about 129.2660614534.

The spelling of 2159999 in words is "two million, one hundred fifty-nine thousand, nine hundred ninety-nine".