3897643 has 4 divisors (see below), whose sum is σ = 3927528. Its totient is φ = 3867760.

The previous prime is 3897637. The next prime is 3897653. The reversal of 3897643 is 3467983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3467983 = 17 ⋅203999.

It is a cyclic number.

It is not a de Polignac number, because 3897643 - 2⁵ = 3897611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3897596 and 3897605.

It is not an unprimeable number, because it can be changed into a prime (3897653) 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, 14746 + ... + 15007.

It is an arithmetic number, because the mean of its divisors is an integer number (981882).

Almost surely, 2^3897643 is an apocalyptic number.

3897643 is a deficient number, since it is larger than the sum of its proper divisors (29885).

3897643 is a wasteful number, since it uses less digits than its factorization.

3897643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29884.

The product of its digits is 108864, while the sum is 40.

The square root of 3897643 is about 1974.2449189500. The cubic root of 3897643 is about 157.3743753449.

The spelling of 3897643 in words is "three million, eight hundred ninety-seven thousand, six hundred forty-three".