2171916 has 18 divisors (see below), whose sum is σ = 5490212. Its totient is φ = 723960.

The previous prime is 2171899. The next prime is 2171929. The reversal of 2171916 is 6191712.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×2171916² = 9434438222112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2171916.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30130 + ... + 30201.

2^2171916 is an apocalyptic number.

It is an amenable number.

2171916 is an abundant number, since it is smaller than the sum of its proper divisors (3318296).

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

2171916 is a wasteful number, since it uses less digits than its factorization.

2171916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60341 (or 60336 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 2171916 is about 1473.7421755517. The cubic root of 2171916 is about 129.5033515826.

The spelling of 2171916 in words is "two million, one hundred seventy-one thousand, nine hundred sixteen".