2190406 has 8 divisors (see below), whose sum is σ = 3307824. Its totient is φ = 1087800.

The previous prime is 2190403. The next prime is 2190407. The reversal of 2190406 is 6040912.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190403) 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, 3325 + ... + 3928.

It is an arithmetic number, because the mean of its divisors is an integer number (413478).

2^2190406 is an apocalyptic number.

2190406 is a deficient number, since it is larger than the sum of its proper divisors (1117418).

2190406 is a wasteful number, since it uses less digits than its factorization.

2190406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2190406 is about 1480.0020270256. The cubic root of 2190406 is about 129.8698104926.

The spelling of 2190406 in words is "two million, one hundred ninety thousand, four hundred six".