3928643 has 4 divisors (see below), whose sum is σ = 3984048. Its totient is φ = 3873240.

The previous prime is 3928637. The next prime is 3928651. The reversal of 3928643 is 3468293.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 3928643 - 2¹⁶ = 3863107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3928663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27596 + ... + 27737.

It is an arithmetic number, because the mean of its divisors is an integer number (996012).

Almost surely, 2^3928643 is an apocalyptic number.

3928643 is a deficient number, since it is larger than the sum of its proper divisors (55405).

3928643 is an equidigital number, since it uses as much as digits as its factorization.

3928643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55404.

The product of its digits is 31104, while the sum is 35.

The square root of 3928643 is about 1982.0804726348. The cubic root of 3928643 is about 157.7905010606.

It can be divided in two parts, 39 and 28643, that added together give a palindrome (28682).

The spelling of 3928643 in words is "three million, nine hundred twenty-eight thousand, six hundred forty-three".