2117920 has 96 divisors (see below), whose sum is σ = 5999616. Its totient is φ = 691200.

The previous prime is 2117903. The next prime is 2117953. The reversal of 2117920 is 297112.

It is a junction number, because it is equal to n+sod(n) for n = 2117891 and 2117900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34690 + ... + 34750.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

2^2117920 is an apocalyptic number.

2117920 is a gapful number since it is divisible by the number (20) 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 2117920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2999808).

2117920 is an abundant number, since it is smaller than the sum of its proper divisors (3881696).

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

2117920 is a wasteful number, since it uses less digits than its factorization.

2117920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2117920 is about 1455.3075276381. The cubic root of 2117920 is about 128.4211389128.

The spelling of 2117920 in words is "two million, one hundred seventeen thousand, nine hundred twenty".