74313821 has 4 divisors (see below), whose sum is σ = 74610144. Its totient is φ = 74017500.

The previous prime is 74313809. The next prime is 74313829. The reversal of 74313821 is 12831347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74313821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74313829) 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, 147785 + ... + 148286.

It is an arithmetic number, because the mean of its divisors is an integer number (18652536).

Almost surely, 2^74313821 is an apocalyptic number.

It is an amenable number.

74313821 is a deficient number, since it is larger than the sum of its proper divisors (296323).

74313821 is a wasteful number, since it uses less digits than its factorization.

74313821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296322.

The product of its digits is 4032, while the sum is 29.

The square root of 74313821 is about 8620.5464443967. The cubic root of 74313821 is about 420.4262886485.

The spelling of 74313821 in words is "seventy-four million, three hundred thirteen thousand, eight hundred twenty-one".