74783309 has 2 divisors, whose sum is σ = 74783310. Its totient is φ = 74783308.

The previous prime is 74783279. The next prime is 74783311. The reversal of 74783309 is 90338747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 26522500 = 6947^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 74783309 - 2¹² = 74779213 is a prime.

It is a Sophie Germain prime.

Together with 74783311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74783399) 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, 37391654 + 37391655.

It is an arithmetic number, because the mean of its divisors is an integer number (37391655).

Almost surely, 2^74783309 is an apocalyptic number.

It is an amenable number.

74783309 is a deficient number, since it is larger than the sum of its proper divisors (1).

74783309 is an equidigital number, since it uses as much as digits as its factorization.

74783309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 74783309 is about 8647.7343275566. The cubic root of 74783309 is about 421.3097980604.

The spelling of 74783309 in words is "seventy-four million, seven hundred eighty-three thousand, three hundred nine".