978289 has 4 divisors (see below), whose sum is σ = 1053556. Its totient is φ = 903024.

The previous prime is 978287. The next prime is 978323. The reversal of 978289 is 982879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982879 = 509 ⋅1931.

It can be written as a sum of positive squares in 2 ways, for example, as 400689 + 577600 = 633^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 978289 - 2¹ = 978287 is a prime.

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 (978283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37614 + ... + 37639.

It is an arithmetic number, because the mean of its divisors is an integer number (263389).

2⁹⁷⁸²⁸⁹ is an apocalyptic number.

It is an amenable number.

978289 is a deficient number, since it is larger than the sum of its proper divisors (75267).

978289 is a wasteful number, since it uses less digits than its factorization.

978289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75266.

The product of its digits is 72576, while the sum is 43.

The square root of 978289 is about 989.0849306303. The cubic root of 978289 is about 99.2709984820.

The spelling of 978289 in words is "nine hundred seventy-eight thousand, two hundred eighty-nine".