978923 has 4 divisors (see below), whose sum is σ = 1067928. Its totient is φ = 889920.

The previous prime is 978917. The next prime is 978931. The reversal of 978923 is 329879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329879 = 11 ⋅29989.

It is a cyclic number.

It is not a de Polignac number, because 978923 - 2⁴ = 978907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978973) 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, 44486 + ... + 44507.

It is an arithmetic number, because the mean of its divisors is an integer number (266982).

2⁹⁷⁸⁹²³ is an apocalyptic number.

978923 is a deficient number, since it is larger than the sum of its proper divisors (89005).

978923 is a wasteful number, since it uses less digits than its factorization.

978923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89004.

The product of its digits is 27216, while the sum is 38.

The square root of 978923 is about 989.4053769815. The cubic root of 978923 is about 99.2924387114.

The spelling of 978923 in words is "nine hundred seventy-eight thousand, nine hundred twenty-three".