2188406 has 12 divisors (see below), whose sum is σ = 3608556. Its totient is φ = 994620.

The previous prime is 2188349. The next prime is 2188409. The reversal of 2188406 is 6048812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4280 + ... + 4763.

It is an arithmetic number, because the mean of its divisors is an integer number (300713).

2^2188406 is an apocalyptic number.

2188406 is a deficient number, since it is larger than the sum of its proper divisors (1420150).

2188406 is a wasteful number, since it uses less digits than its factorization.

2188406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9067 (or 9056 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 2188406 is about 1479.3261979699. The cubic root of 2188406 is about 129.8302715952.

The spelling of 2188406 in words is "two million, one hundred eighty-eight thousand, four hundred six".