2117828 has 12 divisors (see below), whose sum is σ = 3751440. Its totient is φ = 1045992.

The previous prime is 2117821. The next prime is 2117833. The reversal of 2117828 is 8287112.

It is a self number, because there is not a number n which added to its sum of digits gives 2117828.

It is not an unprimeable number, because it can be changed into a prime (2117821) 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, 2858 + ... + 3521.

It is an arithmetic number, because the mean of its divisors is an integer number (312620).

2^2117828 is an apocalyptic number.

It is an amenable number.

2117828 is a deficient number, since it is larger than the sum of its proper divisors (1633612).

2117828 is a wasteful number, since it uses less digits than its factorization.

2117828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6466 (or 6464 counting only the distinct ones).

The product of its digits is 1792, while the sum is 29.

The square root of 2117828 is about 1455.2759188553. The cubic root of 2117828 is about 128.4192793972.

The spelling of 2117828 in words is "two million, one hundred seventeen thousand, eight hundred twenty-eight".