978529 has 4 divisors (see below), whose sum is σ = 980784. Its totient is φ = 976276.

The previous prime is 978521. The next prime is 978541. The reversal of 978529 is 925879.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 925879 = 139 ⋅6661.

It is a cyclic number.

It is not a de Polignac number, because 978529 - 2³ = 978521 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 978491 and 978500.

It is not an unprimeable number, because it can be changed into a prime (978521) 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, 247 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (245196).

2⁹⁷⁸⁵²⁹ is an apocalyptic number.

It is an amenable number.

978529 is a deficient number, since it is larger than the sum of its proper divisors (2255).

978529 is a wasteful number, since it uses less digits than its factorization.

978529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254.

The product of its digits is 45360, while the sum is 40.

The square root of 978529 is about 989.2062474530. The cubic root of 978529 is about 99.2791157464.

Subtracting from 978529 its reverse (925879), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 978529 in words is "nine hundred seventy-eight thousand, five hundred twenty-nine".