73409221 has 8 divisors (see below), whose sum is σ = 75758624. Its totient is φ = 71079120.

The previous prime is 73409201. The next prime is 73409239. The reversal of 73409221 is 12290437.

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

It is a cyclic number.

It is not a de Polignac number, because 73409221 - 2⁷ = 73409093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73409221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73409201) 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, 3106 + ... + 12508.

It is an arithmetic number, because the mean of its divisors is an integer number (9469828).

Almost surely, 2^73409221 is an apocalyptic number.

It is an amenable number.

73409221 is a deficient number, since it is larger than the sum of its proper divisors (2349403).

73409221 is a wasteful number, since it uses less digits than its factorization.

73409221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9651.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 73409221 is about 8567.9181251924. The cubic root of 73409221 is about 418.7134116394.

Adding to 73409221 its reverse (12290437), we get a palindrome (85699658).

It can be divided in two parts, 7340 and 9221, that added together give a palindrome (16561).

The spelling of 73409221 in words is "seventy-three million, four hundred nine thousand, two hundred twenty-one".