4000823 has 2 divisors, whose sum is σ = 4000824. Its totient is φ = 4000822.

The previous prime is 4000813. The next prime is 4000853. The reversal of 4000823 is 3280004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4000823 - 2⁸ = 4000567 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000411 + 2000412.

It is an arithmetic number, because the mean of its divisors is an integer number (2000412).

Almost surely, 2^4000823 is an apocalyptic number.

4000823 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000823 is an equidigital number, since it uses as much as digits as its factorization.

4000823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 4000823 is about 2000.2057394178. The cubic root of 4000823 is about 158.7509913758.

Adding to 4000823 its reverse (3280004), we get a palindrome (7280827).

The spelling of 4000823 in words is "four million, eight hundred twenty-three", and thus it is an aban number.