2117928 has 64 divisors (see below), whose sum is σ = 5832000. Its totient is φ = 637952.

The previous prime is 2117903. The next prime is 2117953. The reversal of 2117928 is 8297112.

It is an interprime number because it is at equal distance from previous prime (2117903) and next prime (2117953).

It is a junction number, because it is equal to n+sod(n) for n = 2117895 and 2117904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11743 + ... + 11921.

It is an arithmetic number, because the mean of its divisors is an integer number (91125).

2^2117928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2117928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2916000).

2117928 is an abundant number, since it is smaller than the sum of its proper divisors (3714072).

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

2117928 is a wasteful number, since it uses less digits than its factorization.

2117928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 230 counting only the distinct ones).

The product of its digits is 2016, while the sum is 30.

The square root of 2117928 is about 1455.3102761954. The cubic root of 2117928 is about 128.4213006073.

The spelling of 2117928 in words is "two million, one hundred seventeen thousand, nine hundred twenty-eight".