2188668 has 12 divisors (see below), whose sum is σ = 5106920. Its totient is φ = 729552.

The previous prime is 2188663. The next prime is 2188673. The reversal of 2188668 is 8668812.

2188668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2188663) and next prime (2188673).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2188668² = 9580535228448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91183 + ... + 91206.

2^2188668 is an apocalyptic number.

It is an amenable number.

2188668 is an abundant number, since it is smaller than the sum of its proper divisors (2918252).

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

2188668 is a wasteful number, since it uses less digits than its factorization.

2188668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182396 (or 182394 counting only the distinct ones).

The product of its digits is 36864, while the sum is 39.

The square root of 2188668 is about 1479.4147491491. The cubic root of 2188668 is about 129.8354525615.

The spelling of 2188668 in words is "two million, one hundred eighty-eight thousand, six hundred sixty-eight".