42336809 has 2 divisors, whose sum is σ = 42336810. Its totient is φ = 42336808.

The previous prime is 42336761. The next prime is 42336823. The reversal of 42336809 is 90863324.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25755625 + 16581184 = 5075^2 + 4072^2 .

It is a cyclic number.

It is not a de Polignac number, because 42336809 - 2¹² = 42332713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42336829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21168404 + 21168405.

It is an arithmetic number, because the mean of its divisors is an integer number (21168405).

Almost surely, 2^42336809 is an apocalyptic number.

It is an amenable number.

42336809 is a deficient number, since it is larger than the sum of its proper divisors (1).

42336809 is an equidigital number, since it uses as much as digits as its factorization.

42336809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 42336809 is about 6506.6741888618. The cubic root of 42336809 is about 348.5293640052.

The spelling of 42336809 in words is "forty-two million, three hundred thirty-six thousand, eight hundred nine".