2188866 has 16 divisors (see below), whose sum is σ = 4428000. Its totient is φ = 721248.

The previous prime is 2188861. The next prime is 2188871. The reversal of 2188866 is 6688812.

It is an interprime number because it is at equal distance from previous prime (2188861) and next prime (2188871).

It is a super-2 number, since 2×2188866² = 9582268731912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2188861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1516 + ... + 2583.

It is an arithmetic number, because the mean of its divisors is an integer number (276750).

2^2188866 is an apocalyptic number.

2188866 is an abundant number, since it is smaller than the sum of its proper divisors (2239134).

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

2188866 is a wasteful number, since it uses less digits than its factorization.

2188866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193.

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

The square root of 2188866 is about 1479.4816659898. The cubic root of 2188866 is about 129.8393676741.

It can be divided in two parts, 218886 and 6, that multiplied together give a square (1313316 = 1146²).

The spelling of 2188866 in words is "two million, one hundred eighty-eight thousand, eight hundred sixty-six".