2188806 has 8 divisors (see below), whose sum is σ = 4377624. Its totient is φ = 729600.

The previous prime is 2188799. The next prime is 2188807. The reversal of 2188806 is 6088812.

It is a sphenic number, since it is the product of 3 distinct primes.

2188806 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182395 + ... + 182406.

It is an arithmetic number, because the mean of its divisors is an integer number (547203).

2^2188806 is an apocalyptic number.

2188806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2188806 is a wasteful number, since it uses less digits than its factorization.

2188806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364806.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 2188806 is about 1479.4613884789. The cubic root of 2188806 is about 129.8381813013.

The spelling of 2188806 in words is "two million, one hundred eighty-eight thousand, eight hundred six".