2217406 has 4 divisors (see below), whose sum is σ = 3326112. Its totient is φ = 1108702.

The previous prime is 2217379. The next prime is 2217409. The reversal of 2217406 is 6047122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6047122 = 2 ⋅3023561.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217409) 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, 554350 + ... + 554353.

It is an arithmetic number, because the mean of its divisors is an integer number (831528).

2^2217406 is an apocalyptic number.

2217406 is a deficient number, since it is larger than the sum of its proper divisors (1108706).

2217406 is a wasteful number, since it uses less digits than its factorization.

2217406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108705.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 2217406 is about 1489.0956987380. The cubic root of 2217406 is about 130.4012454872.

The spelling of 2217406 in words is "two million, two hundred seventeen thousand, four hundred six".