74317821 has 8 divisors (see below), whose sum is σ = 99747264. Its totient is φ = 49216800.

The previous prime is 74317801. The next prime is 74317843. The reversal of 74317821 is 12871347.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74317821 - 2¹⁰ = 74316797 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74317801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81576 + ... + 82481.

It is an arithmetic number, because the mean of its divisors is an integer number (12468408).

Almost surely, 2^74317821 is an apocalyptic number.

It is an amenable number.

74317821 is a deficient number, since it is larger than the sum of its proper divisors (25429443).

74317821 is a wasteful number, since it uses less digits than its factorization.

74317821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164211.

The product of its digits is 9408, while the sum is 33.

The square root of 74317821 is about 8620.7784451290. The cubic root of 74317821 is about 420.4338317720.

The spelling of 74317821 in words is "seventy-four million, three hundred seventeen thousand, eight hundred twenty-one".