2186664 has 32 divisors (see below), whose sum is σ = 5508000. Its totient is φ = 723392.

The previous prime is 2186651. The next prime is 2186677. The reversal of 2186664 is 4666812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2186651) and next prime (2186677).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4042 + ... + 4550.

It is an arithmetic number, because the mean of its divisors is an integer number (172125).

2^2186664 is an apocalyptic number.

2186664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2186664 is an abundant number, since it is smaller than the sum of its proper divisors (3321336).

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

2186664 is a wasteful number, since it uses less digits than its factorization.

2186664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 693 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 2186664 is about 1478.7372991847. The cubic root of 2186664 is about 129.7958135818.

It can be divided in two parts, 2186 and 664, that added together give a triangular number (2850 = T₇₅).

The spelling of 2186664 in words is "two million, one hundred eighty-six thousand, six hundred sixty-four".