4023809 has 2 divisors, whose sum is σ = 4023810. Its totient is φ = 4023808.

The previous prime is 4023791. The next prime is 4023821. The reversal of 4023809 is 9083204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2900209 + 1123600 = 1703^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 4023809 - 2¹² = 4019713 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (4023829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2011904 + 2011905.

It is an arithmetic number, because the mean of its divisors is an integer number (2011905).

Almost surely, 2^4023809 is an apocalyptic number.

It is an amenable number.

4023809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4023809 is an equidigital number, since it uses as much as digits as its factorization.

4023809 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 4023809 is about 2005.9434189428. The cubic root of 4023809 is about 159.0544359579.

The spelling of 4023809 in words is "four million, twenty-three thousand, eight hundred nine".