73847221 has 4 divisors (see below), whose sum is σ = 84396832. Its totient is φ = 63297612.

The previous prime is 73847209. The next prime is 73847251. The reversal of 73847221 is 12274837.

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 not a de Polignac number, because 73847221 - 2¹¹ = 73845173 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 (73847251) 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, 5274795 + ... + 5274808.

It is an arithmetic number, because the mean of its divisors is an integer number (21099208).

Almost surely, 2^73847221 is an apocalyptic number.

It is an amenable number.

73847221 is a deficient number, since it is larger than the sum of its proper divisors (10549611).

73847221 is a wasteful number, since it uses less digits than its factorization.

73847221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10549610.

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

The square root of 73847221 is about 8593.4405798842. The cubic root of 73847221 is about 419.5445194477.

The spelling of 73847221 in words is "seventy-three million, eight hundred forty-seven thousand, two hundred twenty-one".