74396809 has 2 divisors, whose sum is σ = 74396810. Its totient is φ = 74396808.

The previous prime is 74396771. The next prime is 74396821. The reversal of 74396809 is 90869347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73051209 + 1345600 = 8547^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 74396809 - 2⁷ = 74396681 is a prime.

It is a super-3 number, since 3×74396809³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (74396849) 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, 37198404 + 37198405.

It is an arithmetic number, because the mean of its divisors is an integer number (37198405).

Almost surely, 2^74396809 is an apocalyptic number.

It is an amenable number.

74396809 is a deficient number, since it is larger than the sum of its proper divisors (1).

74396809 is an equidigital number, since it uses as much as digits as its factorization.

74396809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 74396809 is about 8625.3584853037. The cubic root of 74396809 is about 420.5827304194.

The spelling of 74396809 in words is "seventy-four million, three hundred ninety-six thousand, eight hundred nine".