2221406 has 16 divisors (see below), whose sum is σ = 3734640. Its totient is φ = 982080.

The previous prime is 2221403. The next prime is 2221411. The reversal of 2221406 is 6041222.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (233415).

2^2221406 is an apocalyptic number.

2221406 is a deficient number, since it is larger than the sum of its proper divisors (1513234).

2221406 is a wasteful number, since it uses less digits than its factorization.

2221406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2221406 is about 1490.4381906003. The cubic root of 2221406 is about 130.4796090726.

Adding to 2221406 its reverse (6041222), we get a palindrome (8262628).

The spelling of 2221406 in words is "two million, two hundred twenty-one thousand, four hundred six".