2221639 has 8 divisors (see below), whose sum is σ = 2649600. Its totient is φ = 1821336.

The previous prime is 2221633. The next prime is 2221657. The reversal of 2221639 is 9361222.

It is a happy number.

2221639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221639 - 2³ = 2221631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6739 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (331200).

2^2221639 is an apocalyptic number.

2221639 is a deficient number, since it is larger than the sum of its proper divisors (427961).

2221639 is a wasteful number, since it uses less digits than its factorization.

2221639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13829.

The product of its digits is 1296, while the sum is 25.

The square root of 2221639 is about 1490.5163534829. The cubic root of 2221639 is about 130.4841708511.

The spelling of 2221639 in words is "two million, two hundred twenty-one thousand, six hundred thirty-nine".