2158899 has 4 divisors (see below), whose sum is σ = 2878536. Its totient is φ = 1439264.

The previous prime is 2158889. The next prime is 2158903. The reversal of 2158899 is 9988512.

It is a happy number.

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 2158899 - 2⁷ = 2158771 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2158899.

It is not an unprimeable number, because it can be changed into a prime (2158859) 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, 359814 + ... + 359819.

It is an arithmetic number, because the mean of its divisors is an integer number (719634).

2^2158899 is an apocalyptic number.

2158899 is a deficient number, since it is larger than the sum of its proper divisors (719637).

2158899 is an equidigital number, since it uses as much as digits as its factorization.

2158899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719636.

The product of its digits is 51840, while the sum is 42.

The square root of 2158899 is about 1469.3192301199. The cubic root of 2158899 is about 129.2441144044.

The spelling of 2158899 in words is "two million, one hundred fifty-eight thousand, eight hundred ninety-nine".