74847221 has 4 divisors (see below), whose sum is σ = 78101472. Its totient is φ = 71592972.

The previous prime is 74847217. The next prime is 74847259. The reversal of 74847221 is 12274847.

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 74847221 - 2² = 74847217 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 (74847211) 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, 1627091 + ... + 1627136.

It is an arithmetic number, because the mean of its divisors is an integer number (19525368).

Almost surely, 2^74847221 is an apocalyptic number.

It is an amenable number.

74847221 is a deficient number, since it is larger than the sum of its proper divisors (3254251).

74847221 is a wasteful number, since it uses less digits than its factorization.

74847221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254250.

The product of its digits is 25088, while the sum is 35.

The square root of 74847221 is about 8651.4288415267. The cubic root of 74847221 is about 421.4297851048.

The spelling of 74847221 in words is "seventy-four million, eight hundred forty-seven thousand, two hundred twenty-one".