2117980 has 12 divisors (see below), whose sum is σ = 4447800. Its totient is φ = 847184.

The previous prime is 2117977. The next prime is 2118007. The reversal of 2117980 is 897112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52930 + ... + 52969.

It is an arithmetic number, because the mean of its divisors is an integer number (370650).

2^2117980 is an apocalyptic number.

2117980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2117980 is an abundant number, since it is smaller than the sum of its proper divisors (2329820).

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

2117980 is a wasteful number, since it uses less digits than its factorization.

2117980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105908 (or 105906 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2117980 is about 1455.3281416918. The cubic root of 2117980 is about 128.4223516114.

The spelling of 2117980 in words is "two million, one hundred seventeen thousand, nine hundred eighty".