2171668 has 12 divisors (see below), whose sum is σ = 3824352. Its totient is φ = 1079000.

The previous prime is 2171657. The next prime is 2171707. The reversal of 2171668 is 8661712.

It is a super-2 number, since 2×2171668² = 9432283804448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958 + ... + 2293.

It is an arithmetic number, because the mean of its divisors is an integer number (318696).

2^2171668 is an apocalyptic number.

It is an amenable number.

2171668 is a deficient number, since it is larger than the sum of its proper divisors (1652684).

2171668 is a wasteful number, since it uses less digits than its factorization.

2171668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422 (or 3420 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 2171668 is about 1473.6580336021. The cubic root of 2171668 is about 129.4984222862.

The spelling of 2171668 in words is "two million, one hundred seventy-one thousand, six hundred sixty-eight".