918321 has 8 divisors (see below), whose sum is σ = 1277760. Its totient is φ = 585552.

The previous prime is 918319. The next prime is 918329. The reversal of 918321 is 123819.

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

It is not a de Polignac number, because 918321 - 2¹ = 918319 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 918291 and 918300.

It is not an unprimeable number, because it can be changed into a prime (918329) 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, 6586 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (159720).

2⁹¹⁸³²¹ is an apocalyptic number.

It is an amenable number.

918321 is a deficient number, since it is larger than the sum of its proper divisors (359439).

918321 is a wasteful number, since it uses less digits than its factorization.

918321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13335.

The product of its digits is 432, while the sum is 24.

The square root of 918321 is about 958.2906657168. The cubic root of 918321 is about 97.1996807725.

The spelling of 918321 in words is "nine hundred eighteen thousand, three hundred twenty-one".