8042409 has 10 divisors (see below), whose sum is σ = 12014090. Its totient is φ = 5361552.

The previous prime is 8042407. The next prime is 8042413. The reversal of 8042409 is 9042408.

It can be written as a sum of positive squares in only one way, i.e., 8037225 + 5184 = 2835^2 + 72^2 .

It is not a de Polignac number, because 8042409 - 2¹ = 8042407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8042407) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 49564 + ... + 49725.

It is an arithmetic number, because the mean of its divisors is an integer number (1201409).

Almost surely, 2^8042409 is an apocalyptic number.

It is an amenable number.

8042409 is a deficient number, since it is larger than the sum of its proper divisors (3971681).

8042409 is an equidigital number, since it uses as much as digits as its factorization.

8042409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99301 (or 99292 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 8042409 is about 2835.9141383335. The cubic root of 8042409 is about 200.3527856788.

Subtracting 8042409 from its reverse (9042408), we obtain a palindrome (999999).

The spelling of 8042409 in words is "eight million, forty-two thousand, four hundred nine".