978724 has 24 divisors (see below), whose sum is σ = 1867320. Its totient is φ = 446976.

The previous prime is 978713. The next prime is 978727. The reversal of 978724 is 427879.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 338724 + 640000 = 582^2 + 800^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978727) 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, 2322 + ... + 2710.

It is an arithmetic number, because the mean of its divisors is an integer number (77805).

2⁹⁷⁸⁷²⁴ is an apocalyptic number.

It is an amenable number.

978724 is a deficient number, since it is larger than the sum of its proper divisors (888596).

978724 is a wasteful number, since it uses less digits than its factorization.

978724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 445 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 978724 is about 989.3048064171. The cubic root of 978724 is about 99.2857100466.

The spelling of 978724 in words is "nine hundred seventy-eight thousand, seven hundred twenty-four".