2117808 has 120 divisors (see below), whose sum is σ = 7428096. Its totient is φ = 547200.

The previous prime is 2117777. The next prime is 2117813. The reversal of 2117808 is 8087112.

It is a super-2 number, since 2×2117808² = 8970221449728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10993 + ... + 11183.

2^2117808 is an apocalyptic number.

2117808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2117808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3714048).

2117808 is an abundant number, since it is smaller than the sum of its proper divisors (5310288).

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

2117808 is a wasteful number, since it uses less digits than its factorization.

2117808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 2117808 is about 1455.2690472899. The cubic root of 2117808 is about 128.4188751475.

The spelling of 2117808 in words is "two million, one hundred seventeen thousand, eight hundred eight".