74273809 has 2 divisors, whose sum is σ = 74273810. Its totient is φ = 74273808.

The previous prime is 74273807. The next prime is 74273819. The reversal of 74273809 is 90837247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38093584 + 36180225 = 6172^2 + 6015^2 .

It is an emirp because it is prime and its reverse (90837247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74273809 - 2¹ = 74273807 is a prime.

Together with 74273807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (74273803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37136904 + 37136905.

It is an arithmetic number, because the mean of its divisors is an integer number (37136905).

Almost surely, 2^74273809 is an apocalyptic number.

It is an amenable number.

74273809 is a deficient number, since it is larger than the sum of its proper divisors (1).

74273809 is an equidigital number, since it uses as much as digits as its factorization.

74273809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 74273809 is about 8618.2253973774. The cubic root of 74273809 is about 420.3508198844.

It can be divided in two parts, 7427 and 3809, that added together give a square (11236 = 106²).

The spelling of 74273809 in words is "seventy-four million, two hundred seventy-three thousand, eight hundred nine".