74387809 has 2 divisors, whose sum is σ = 74387810. Its totient is φ = 74387808.

The previous prime is 74387777. The next prime is 74387843. The reversal of 74387809 is 90878347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 685584 = 8585^2 + 828^2 .

It is a cyclic number.

It is not a de Polignac number, because 74387809 - 2⁵ = 74387777 is a prime.

It is a super-2 number, since 2×74387809² = 11067092255640962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74387009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37193904 + 37193905.

It is an arithmetic number, because the mean of its divisors is an integer number (37193905).

Almost surely, 2^74387809 is an apocalyptic number.

It is an amenable number.

74387809 is a deficient number, since it is larger than the sum of its proper divisors (1).

74387809 is an equidigital number, since it uses as much as digits as its factorization.

74387809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 74387809 is about 8624.8367520783. The cubic root of 74387809 is about 420.5657700270.

The spelling of 74387809 in words is "seventy-four million, three hundred eighty-seven thousand, eight hundred nine".