2221604 has 24 divisors (see below), whose sum is σ = 4847808. Its totient is φ = 865440.

The previous prime is 2221589. The next prime is 2221631. The reversal of 2221604 is 4061222.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3299 + ... + 3914.

It is an arithmetic number, because the mean of its divisors is an integer number (201992).

2^2221604 is an apocalyptic number.

It is an amenable number.

2221604 is an abundant number, since it is smaller than the sum of its proper divisors (2626204).

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

2221604 is a wasteful number, since it uses less digits than its factorization.

2221604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7235 (or 7233 counting only the distinct ones).

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

The square root of 2221604 is about 1490.5046125390. The cubic root of 2221604 is about 130.4834856257.

Adding to 2221604 its reverse (4061222), we get a palindrome (6282826).

The spelling of 2221604 in words is "two million, two hundred twenty-one thousand, six hundred four".