3806643 has 4 divisors (see below), whose sum is σ = 5075528. Its totient is φ = 2537760.

The previous prime is 3806641. The next prime is 3806653. The reversal of 3806643 is 3466083.

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

It is not a de Polignac number, because 3806643 - 2¹ = 3806641 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3806643.

It is not an unprimeable number, because it can be changed into a prime (3806641) 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, 634438 + ... + 634443.

It is an arithmetic number, because the mean of its divisors is an integer number (1268882).

Almost surely, 2^3806643 is an apocalyptic number.

3806643 is a deficient number, since it is larger than the sum of its proper divisors (1268885).

3806643 is a wasteful number, since it uses less digits than its factorization.

3806643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268884.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 3806643 is about 1951.0620184915. The cubic root of 3806643 is about 156.1399549414.

The spelling of 3806643 in words is "three million, eight hundred six thousand, six hundred forty-three".