74681393 has 4 divisors (see below), whose sum is σ = 75002148. Its totient is φ = 74360640.

The previous prime is 74681389. The next prime is 74681417. The reversal of 74681393 is 39318647.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39318647 = 167 ⋅235441.

It can be written as a sum of positive squares in 2 ways, for example, as 49801249 + 24880144 = 7057^2 + 4988^2 .

It is a cyclic number.

It is not a de Polignac number, because 74681393 - 2² = 74681389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74681393.

It is not an unprimeable number, because it can be changed into a prime (74681093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160028 + ... + 160493.

It is an arithmetic number, because the mean of its divisors is an integer number (18750537).

Almost surely, 2^74681393 is an apocalyptic number.

It is an amenable number.

74681393 is a deficient number, since it is larger than the sum of its proper divisors (320755).

74681393 is a wasteful number, since it uses less digits than its factorization.

74681393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320754.

The product of its digits is 108864, while the sum is 41.

The square root of 74681393 is about 8641.8396768281. The cubic root of 74681393 is about 421.1183216004.

The spelling of 74681393 in words is "seventy-four million, six hundred eighty-one thousand, three hundred ninety-three".