3887643 has 4 divisors (see below), whose sum is σ = 5183528. Its totient is φ = 2591760.

The previous prime is 3887641. The next prime is 3887657. The reversal of 3887643 is 3467883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3467883 = 3 ⋅1155961.

It is not a de Polignac number, because 3887643 - 2¹ = 3887641 is a prime.

It is a super-2 number, since 2×3887643² = 30227536190898, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3¹² + 8⁵ + 8⁵ + 7³ + 6⁸ + 4⁷ + 3¹³ .

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3887641) 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, 647938 + ... + 647943.

It is an arithmetic number, because the mean of its divisors is an integer number (1295882).

Almost surely, 2^3887643 is an apocalyptic number.

3887643 is a deficient number, since it is larger than the sum of its proper divisors (1295885).

3887643 is a wasteful number, since it uses less digits than its factorization.

3887643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295884.

The product of its digits is 96768, while the sum is 39.

The square root of 3887643 is about 1971.7106785733. The cubic root of 3887643 is about 157.2396707240.

The spelling of 3887643 in words is "three million, eight hundred eighty-seven thousand, six hundred forty-three".