2158819 has 4 divisors (see below), whose sum is σ = 2324896. Its totient is φ = 1992744.

The previous prime is 2158817. The next prime is 2158823. The reversal of 2158819 is 9188512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2158819 - 2¹ = 2158817 is a prime.

It is a super-2 number, since 2×2158819² = 9320998949522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158811) 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, 83019 + ... + 83044.

It is an arithmetic number, because the mean of its divisors is an integer number (581224).

2^2158819 is an apocalyptic number.

2158819 is a deficient number, since it is larger than the sum of its proper divisors (166077).

2158819 is a wasteful number, since it uses less digits than its factorization.

2158819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166076.

The product of its digits is 5760, while the sum is 34.

The square root of 2158819 is about 1469.2920063759. The cubic root of 2158819 is about 129.2425179646.

The spelling of 2158819 in words is "two million, one hundred fifty-eight thousand, eight hundred nineteen".