2158863 has 16 divisors (see below), whose sum is σ = 3311616. Its totient is φ = 1225440.

The previous prime is 2158859. The next prime is 2158889. The reversal of 2158863 is 3688512.

It is a happy number.

It is not a de Polignac number, because 2158863 - 2² = 2158859 is a prime.

2158863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4453 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (206976).

2^2158863 is an apocalyptic number.

2158863 is a deficient number, since it is larger than the sum of its proper divisors (1152753).

2158863 is a wasteful number, since it uses less digits than its factorization.

2158863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694.

The product of its digits is 11520, while the sum is 33.

The square root of 2158863 is about 1469.3069794975. The cubic root of 2158863 is about 129.2433960113.

The spelling of 2158863 in words is "two million, one hundred fifty-eight thousand, eight hundred sixty-three".