2243638 has 4 divisors (see below), whose sum is σ = 3365460. Its totient is φ = 1121818.

The previous prime is 2243623. The next prime is 2243663. The reversal of 2243638 is 8363422.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×2243638² = 10067822950088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560908 + ... + 560911.

It is an arithmetic number, because the mean of its divisors is an integer number (841365).

2^2243638 is an apocalyptic number.

2243638 is a deficient number, since it is larger than the sum of its proper divisors (1121822).

2243638 is a wasteful number, since it uses less digits than its factorization.

2243638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121821.

The product of its digits is 6912, while the sum is 28.

The square root of 2243638 is about 1497.8778321345. The cubic root of 2243638 is about 130.9134482568.

It can be divided in two parts, 22 and 43638, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 2243638 in words is "two million, two hundred forty-three thousand, six hundred thirty-eight".