4081643 has 4 divisors (see below), whose sum is σ = 4102560. Its totient is φ = 4060728.

The previous prime is 4081613. The next prime is 4081657. The reversal of 4081643 is 3461804.

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 4081643 - 2⁶ = 4081579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4081613) 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, 10163 + ... + 10556.

It is an arithmetic number, because the mean of its divisors is an integer number (1025640).

Almost surely, 2^4081643 is an apocalyptic number.

4081643 is a deficient number, since it is larger than the sum of its proper divisors (20917).

4081643 is a wasteful number, since it uses less digits than its factorization.

4081643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20916.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 4081643 is about 2020.3076498395. The cubic root of 4081643 is about 159.8128410533.

The spelling of 4081643 in words is "four million, eighty-one thousand, six hundred forty-three".