2213639 has 4 divisors (see below), whose sum is σ = 2216760. Its totient is φ = 2210520.

The previous prime is 2213623. The next prime is 2213647. The reversal of 2213639 is 9363122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9363122 = 2 ⋅4681561.

It is a cyclic number.

It is not a de Polignac number, because 2213639 - 2⁴ = 2213623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77 + ... + 2105.

It is an arithmetic number, because the mean of its divisors is an integer number (554190).

2^2213639 is an apocalyptic number.

2213639 is a deficient number, since it is larger than the sum of its proper divisors (3121).

2213639 is a wasteful number, since it uses less digits than its factorization.

2213639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120.

The product of its digits is 1944, while the sum is 26.

The square root of 2213639 is about 1487.8302994629. The cubic root of 2213639 is about 130.3273603677.

The spelling of 2213639 in words is "two million, two hundred thirteen thousand, six hundred thirty-nine".