4020817 has 4 divisors (see below), whose sum is σ = 4025700. Its totient is φ = 4015936.

The previous prime is 4020781. The next prime is 4020833. The reversal of 4020817 is 7180204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2359296 + 1661521 = 1536^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020817 - 2¹¹ = 4018769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020847) 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, 868 + ... + 2965.

It is an arithmetic number, because the mean of its divisors is an integer number (1006425).

Almost surely, 2^4020817 is an apocalyptic number.

It is an amenable number.

4020817 is a deficient number, since it is larger than the sum of its proper divisors (4883).

4020817 is a wasteful number, since it uses less digits than its factorization.

4020817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4882.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 4020817 is about 2005.1974965075. The cubic root of 4020817 is about 159.0150032650.

The spelling of 4020817 in words is "four million, twenty thousand, eight hundred seventeen".