6872321 has 8 divisors (see below), whose sum is σ = 7053864. Its totient is φ = 6693120.

The previous prime is 6872311. The next prime is 6872329. The reversal of 6872321 is 1232786.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7921 + 6864400 = 89^2 + 2620^2 .

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 6872321 - 2²² = 2678017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6872329) 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, 6395 + ... + 7391.

It is an arithmetic number, because the mean of its divisors is an integer number (881733).

Almost surely, 2^6872321 is an apocalyptic number.

6872321 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6872321 is a deficient number, since it is larger than the sum of its proper divisors (181543).

6872321 is a wasteful number, since it uses less digits than its factorization.

6872321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171.

The product of its digits is 4032, while the sum is 29.

The square root of 6872321 is about 2621.5112053928. The cubic root of 6872321 is about 190.1229213817.

The spelling of 6872321 in words is "six million, eight hundred seventy-two thousand, three hundred twenty-one".