978393 has 8 divisors (see below), whose sum is σ = 1404928. Its totient is φ = 602064.

The previous prime is 978389. The next prime is 978403. The reversal of 978393 is 393879.

It is a happy number.

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

It is not a de Polignac number, because 978393 - 2² = 978389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 25087 = 978393 / (9 + 7 + 8 + 3 + 9 + 3).

It is a Duffinian number.

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, 12505 + ... + 12582.

It is an arithmetic number, because the mean of its divisors is an integer number (175616).

2⁹⁷⁸³⁹³ is an apocalyptic number.

It is an amenable number.

978393 is a deficient number, since it is larger than the sum of its proper divisors (426535).

978393 is a wasteful number, since it uses less digits than its factorization.

978393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25103.

The product of its digits is 40824, while the sum is 39.

The square root of 978393 is about 989.1375030803. The cubic root of 978393 is about 99.2745161262.

The spelling of 978393 in words is "nine hundred seventy-eight thousand, three hundred ninety-three".