2188809 has 32 divisors (see below), whose sum is σ = 3818240. Its totient is φ = 1213056.

The previous prime is 2188807. The next prime is 2188811. The reversal of 2188809 is 9088812.

It is an interprime number because it is at equal distance from previous prime (2188807) and next prime (2188811).

It is not a de Polignac number, because 2188809 - 2¹ = 2188807 is a prime.

It is a Duffinian 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 31 ways as a sum of consecutive naturals, for example, 6837 + ... + 7149.

It is an arithmetic number, because the mean of its divisors is an integer number (119320).

2^2188809 is an apocalyptic number.

It is an amenable number.

2188809 is a deficient number, since it is larger than the sum of its proper divisors (1629431).

2188809 is a wasteful number, since it uses less digits than its factorization.

2188809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 2188809 is about 1479.4624023611. The cubic root of 2188809 is about 129.8382406204.

The spelling of 2188809 in words is "two million, one hundred eighty-eight thousand, eight hundred nine".