978671 has 6 divisors (see below), whose sum is σ = 1033272. Its totient is φ = 926820.

The previous prime is 978647. The next prime is 978683. The reversal of 978671 is 176879.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-978671 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 995 + ... + 1716.

It is an arithmetic number, because the mean of its divisors is an integer number (172212).

978671 is a Friedman number, since it can be written as (8^7*7+1)/(9+6), using all its digits and the basic arithmetic operations.

2⁹⁷⁸⁶⁷¹ is an apocalyptic number.

978671 is a deficient number, since it is larger than the sum of its proper divisors (54601).

978671 is a wasteful number, since it uses less digits than its factorization.

978671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2730 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 978671 is about 989.2780195678. The cubic root of 978671 is about 99.2839178363.

The spelling of 978671 in words is "nine hundred seventy-eight thousand, six hundred seventy-one".