978321 has 8 divisors (see below), whose sum is σ = 1320480. Its totient is φ = 644192.

The previous prime is 978287. The next prime is 978323. The reversal of 978321 is 123879.

It is a happy number.

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 978321 - 2¹⁴ = 961937 is a prime.

It is a super-2 number, since 2×978321² = 1914223958082, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (978323) 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, 1716 + ... + 2213.

It is an arithmetic number, because the mean of its divisors is an integer number (165060).

2⁹⁷⁸³²¹ is an apocalyptic number.

It is an amenable number.

978321 is a deficient number, since it is larger than the sum of its proper divisors (342159).

978321 is a wasteful number, since it uses less digits than its factorization.

978321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015.

The product of its digits is 3024, while the sum is 30.

The square root of 978321 is about 989.1011070664. The cubic root of 978321 is about 99.2720808606.

The spelling of 978321 in words is "nine hundred seventy-eight thousand, three hundred twenty-one".