2156899 has 8 divisors (see below), whose sum is σ = 2308880. Its totient is φ = 2008800.

The previous prime is 2156897. The next prime is 2156939. The reversal of 2156899 is 9986512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2156899 - 2¹ = 2156897 is a prime.

2156899 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2156897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229 + ... + 2089.

It is an arithmetic number, because the mean of its divisors is an integer number (288610).

2^2156899 is an apocalyptic number.

2156899 is a deficient number, since it is larger than the sum of its proper divisors (151981).

2156899 is a wasteful number, since it uses less digits than its factorization.

2156899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941.

The product of its digits is 38880, while the sum is 40.

The square root of 2156899 is about 1468.6384851283. The cubic root of 2156899 is about 129.2041915717.

The spelling of 2156899 in words is "two million, one hundred fifty-six thousand, eight hundred ninety-nine".