8042009 has 2 divisors, whose sum is σ = 8042010. Its totient is φ = 8042008.

The previous prime is 8041993. The next prime is 8042017. The reversal of 8042009 is 9002408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6390784 + 1651225 = 2528^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 8042009 - 2⁴ = 8041993 is a prime.

It is not a weakly prime, because it can be changed into another prime (8042059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4021004 + 4021005.

It is an arithmetic number, because the mean of its divisors is an integer number (4021005).

Almost surely, 2^8042009 is an apocalyptic number.

It is an amenable number.

8042009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8042009 is an equidigital number, since it uses as much as digits as its factorization.

8042009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 8042009 is about 2835.8436134597. The cubic root of 8042009 is about 200.3494640188.

The spelling of 8042009 in words is "eight million, forty-two thousand, nine".