2221623 has 12 divisors (see below), whose sum is σ = 3228160. Its totient is φ = 1472256.

The previous prime is 2221589. The next prime is 2221631. The reversal of 2221623 is 3261222.

2221623 is a `hidden beast` number, since 22 + 21 + 623 = 666.

It is not a de Polignac number, because 2221623 - 2⁹ = 2221111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221596 and 2221605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1098 + ... + 2376.

2^2221623 is an apocalyptic number.

2221623 is a deficient number, since it is larger than the sum of its proper divisors (1006537).

2221623 is a wasteful number, since it uses less digits than its factorization.

2221623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478 (or 1475 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 2221623 is about 1490.5109862057. The cubic root of 2221623 is about 130.4838576061.

Adding to 2221623 its reverse (3261222), we get a palindrome (5482845).

The spelling of 2221623 in words is "two million, two hundred twenty-one thousand, six hundred twenty-three".