74073821 has 4 divisors (see below), whose sum is σ = 75796512. Its totient is φ = 72351132.

The previous prime is 74073809. The next prime is 74073827. The reversal of 74073821 is 12837047.

It is a happy number.

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 not a de Polignac number, because 74073821 - 2¹⁸ = 73811677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74073827) 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, 861281 + ... + 861366.

It is an arithmetic number, because the mean of its divisors is an integer number (18949128).

Almost surely, 2^74073821 is an apocalyptic number.

It is an amenable number.

74073821 is a deficient number, since it is larger than the sum of its proper divisors (1722691).

74073821 is a wasteful number, since it uses less digits than its factorization.

74073821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722690.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 74073821 is about 8606.6149559510. The cubic root of 74073821 is about 419.9732050177.

The spelling of 74073821 in words is "seventy-four million, seventy-three thousand, eight hundred twenty-one".