978442 has 8 divisors (see below), whose sum is σ = 1473732. Its totient is φ = 487200.

The previous prime is 978427. The next prime is 978449. The reversal of 978442 is 244879.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 900601 + 77841 = 949^2 + 279^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 978398 and 978407.

It is not an unprimeable number, because it can be changed into a prime (978449) by changing a digit.

978442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309 + ... + 1432.

2⁹⁷⁸⁴⁴² is an apocalyptic number.

978442 is a deficient number, since it is larger than the sum of its proper divisors (495290).

978442 is a wasteful number, since it uses less digits than its factorization.

978442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024.

The product of its digits is 16128, while the sum is 34.

The square root of 978442 is about 989.1622718240. The cubic root of 978442 is about 99.2761733914.

The spelling of 978442 in words is "nine hundred seventy-eight thousand, four hundred forty-two".