978646 has 8 divisors (see below), whose sum is σ = 1472184. Its totient is φ = 487920.

The previous prime is 978643. The next prime is 978647. The reversal of 978646 is 646879.

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

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 978599 and 978608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (184023).

2⁹⁷⁸⁶⁴⁶ is an apocalyptic number.

978646 is a deficient number, since it is larger than the sum of its proper divisors (493538).

978646 is a wasteful number, since it uses less digits than its factorization.

978646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406.

The product of its digits is 72576, while the sum is 40.

The square root of 978646 is about 989.2653840098. The cubic root of 978646 is about 99.2830724316.

The spelling of 978646 in words is "nine hundred seventy-eight thousand, six hundred forty-six".