74327821 has 4 divisors (see below), whose sum is σ = 75909312. Its totient is φ = 72746332.

The previous prime is 74327809. The next prime is 74327833. The reversal of 74327821 is 12872347.

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 an interprime number because it is at equal distance from previous prime (74327809) and next prime (74327833).

It is a cyclic number.

It is not a de Polignac number, because 74327821 - 2¹⁹ = 73803533 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 (74324821) 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 in 3 ways as a sum of consecutive naturals, for example, 790675 + ... + 790768.

It is an arithmetic number, because the mean of its divisors is an integer number (18977328).

Almost surely, 2^74327821 is an apocalyptic number.

It is an amenable number.

74327821 is a deficient number, since it is larger than the sum of its proper divisors (1581491).

74327821 is a wasteful number, since it uses less digits than its factorization.

74327821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581490.

The product of its digits is 18816, while the sum is 34.

The square root of 74327821 is about 8621.3584196459. The cubic root of 74327821 is about 420.4526883966.

The spelling of 74327821 in words is "seventy-four million, three hundred twenty-seven thousand, eight hundred twenty-one".