2190906 has 24 divisors (see below), whose sum is σ = 4829760. Its totient is φ = 717576.

The previous prime is 2190901. The next prime is 2190959. The reversal of 2190906 is 6090912.

It is a happy number.

2190906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2190906.

It is not an unprimeable number, because it can be changed into a prime (2190901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31 + ... + 2093.

It is an arithmetic number, because the mean of its divisors is an integer number (201240).

2^2190906 is an apocalyptic number.

2190906 is an abundant number, since it is smaller than the sum of its proper divisors (2638854).

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

2190906 is a wasteful number, since it uses less digits than its factorization.

2190906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 2190906 is about 1480.1709360746. The cubic root of 2190906 is about 129.8796914561.

The spelling of 2190906 in words is "two million, one hundred ninety thousand, nine hundred six".