2219906 has 8 divisors (see below), whose sum is σ = 3586044. Its totient is φ = 1024560.

The previous prime is 2219887. The next prime is 2219923. The reversal of 2219906 is 6099122.

2219906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1809025 + 410881 = 1345^2 + 641^2 .

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

It is an Ulam number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 42665 + ... + 42716.

2^2219906 is an apocalyptic number.

2219906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2219906 is a deficient number, since it is larger than the sum of its proper divisors (1366138).

2219906 is a wasteful number, since it uses less digits than its factorization.

2219906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85396.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 2219906 is about 1489.9348979066. The cubic root of 2219906 is about 130.4502337606.

It can be divided in two parts, 2219 and 906, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2219906 in words is "two million, two hundred nineteen thousand, nine hundred six".