2105638 has 4 divisors (see below), whose sum is σ = 3158460. Its totient is φ = 1052818.

The previous prime is 2105611. The next prime is 2105641. The reversal of 2105638 is 8365012.

It is a happy number.

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

It is a super-2 number, since 2×2105638² = 8867422774088, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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, 526408 + ... + 526411.

It is an arithmetic number, because the mean of its divisors is an integer number (789615).

2^2105638 is an apocalyptic number.

2105638 is a deficient number, since it is larger than the sum of its proper divisors (1052822).

2105638 is a wasteful number, since it uses less digits than its factorization.

2105638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052821.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2105638 is about 1451.0816655171. The cubic root of 2105638 is about 128.1724157640.

The spelling of 2105638 in words is "two million, one hundred five thousand, six hundred thirty-eight".