4020643 has 4 divisors (see below), whose sum is σ = 4386168. Its totient is φ = 3655120.

The previous prime is 4020641. The next prime is 4020671. The reversal of 4020643 is 3460204.

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 4020643 - 2¹ = 4020641 is a prime.

It is an Ulam 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 4020643.

It is not an unprimeable number, because it can be changed into a prime (4020641) 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, 182746 + ... + 182767.

It is an arithmetic number, because the mean of its divisors is an integer number (1096542).

Almost surely, 2^4020643 is an apocalyptic number.

4020643 is a deficient number, since it is larger than the sum of its proper divisors (365525).

4020643 is a wasteful number, since it uses less digits than its factorization.

4020643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365524.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 4020643 is about 2005.1541087906. The cubic root of 4020643 is about 159.0127094517.

Adding to 4020643 its reverse (3460204), we get a palindrome (7480847).

The spelling of 4020643 in words is "four million, twenty thousand, six hundred forty-three".