74243593 has 2 divisors, whose sum is σ = 74243594. Its totient is φ = 74243592.

The previous prime is 74243591. The next prime is 74243623. The reversal of 74243593 is 39534247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59474944 + 14768649 = 7712^2 + 3843^2 .

It is an emirp because it is prime and its reverse (39534247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74243593 - 2¹ = 74243591 is a prime.

It is a super-2 number, since 2×74243593² = 11024222203099298, which contains 22 as substring.

Together with 74243591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (74243591) 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, 37121796 + 37121797.

It is an arithmetic number, because the mean of its divisors is an integer number (37121797).

Almost surely, 2^74243593 is an apocalyptic number.

It is an amenable number.

74243593 is a deficient number, since it is larger than the sum of its proper divisors (1).

74243593 is an equidigital number, since it uses as much as digits as its factorization.

74243593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 37.

The square root of 74243593 is about 8616.4721899395. The cubic root of 74243593 is about 420.2938099132.

It can be divided in two parts, 7 and 4243593, that added together give a square (4243600 = 2060²).

The spelling of 74243593 in words is "seventy-four million, two hundred forty-three thousand, five hundred ninety-three".