2209406 has 4 divisors (see below), whose sum is σ = 3314112. Its totient is φ = 1104702.

The previous prime is 2209343. The next prime is 2209409. The reversal of 2209406 is 6049022.

It is a semiprime because it is the product of two 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 (2209409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 552350 + ... + 552353.

It is an arithmetic number, because the mean of its divisors is an integer number (828528).

2^2209406 is an apocalyptic number.

2209406 is a deficient number, since it is larger than the sum of its proper divisors (1104706).

2209406 is a wasteful number, since it uses less digits than its factorization.

2209406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104705.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 2209406 is about 1486.4070774858. The cubic root of 2209406 is about 130.2442351404.

The spelling of 2209406 in words is "two million, two hundred nine thousand, four hundred six".