2117898 has 24 divisors (see below), whose sum is σ = 4639908. Its totient is φ = 698112.

The previous prime is 2117893. The next prime is 2117903. The reversal of 2117898 is 8987112.

It is an interprime number because it is at equal distance from previous prime (2117893) and next prime (2117903).

It can be written as a sum of positive squares in 2 ways, for example, as 1912689 + 205209 = 1383^2 + 453^2 .

It is not an unprimeable number, because it can be changed into a prime (2117893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1140 + ... + 2352.

2^2117898 is an apocalyptic number.

2117898 is an abundant number, since it is smaller than the sum of its proper divisors (2522010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2117898 is a wasteful number, since it uses less digits than its factorization.

2117898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318 (or 1315 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 2117898 is about 1455.2999690785. The cubic root of 2117898 is about 128.4206942509.

The spelling of 2117898 in words is "two million, one hundred seventeen thousand, eight hundred ninety-eight".