7273821 has 8 divisors (see below), whose sum is σ = 9763264. Its totient is φ = 4816800.

The previous prime is 7273817. The next prime is 7273829. The reversal of 7273821 is 1283727.

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

It is not a de Polignac number, because 7273821 - 2² = 7273817 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7273829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7576 + ... + 8481.

It is an arithmetic number, because the mean of its divisors is an integer number (1220408).

Almost surely, 2^7273821 is an apocalyptic number.

It is an amenable number.

7273821 is a deficient number, since it is larger than the sum of its proper divisors (2489443).

7273821 is a wasteful number, since it uses less digits than its factorization.

7273821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16211.

The product of its digits is 4704, while the sum is 30.

The square root of 7273821 is about 2697.0022246932. The cubic root of 7273821 is about 193.7555730620.

The spelling of 7273821 in words is "seven million, two hundred seventy-three thousand, eight hundred twenty-one".