4009823 has 2 divisors, whose sum is σ = 4009824. Its totient is φ = 4009822.

The previous prime is 4009799. The next prime is 4009849. The reversal of 4009823 is 3289004.

It is an a-pointer prime, because the next prime (4009849) can be obtained adding 4009823 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4009823 - 2¹⁰ = 4008799 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 4009792 and 4009801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2004911 + 2004912.

It is an arithmetic number, because the mean of its divisors is an integer number (2004912).

Almost surely, 2^4009823 is an apocalyptic number.

4009823 is a deficient number, since it is larger than the sum of its proper divisors (1).

4009823 is an equidigital number, since it uses as much as digits as its factorization.

4009823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 4009823 is about 2002.4542441714. The cubic root of 4009823 is about 158.8699409778.

The spelling of 4009823 in words is "four million, nine thousand, eight hundred twenty-three".