978967889 has 4 divisors (see below), whose sum is σ = 979032756. Its totient is φ = 978903024.

The previous prime is 978967849. The next prime is 978967939. The reversal of 978967889 is 988769879.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 988769879 = 47 ⋅21037657.

It can be written as a sum of positive squares in 2 ways, for example, as 937584400 + 41383489 = 30620^2 + 6433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978967889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978967849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3407 + ... + 44379.

It is an arithmetic number, because the mean of its divisors is an integer number (244758189).

Almost surely, 2^978967889 is an apocalyptic number.

It is an amenable number.

978967889 is a deficient number, since it is larger than the sum of its proper divisors (64867).

978967889 is a wasteful number, since it uses less digits than its factorization.

978967889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64866.

The product of its digits is 109734912, while the sum is 71.

The square root of 978967889 is about 31288.4625541109. The cubic root of 978967889 is about 992.9395638957.

The spelling of 978967889 in words is "nine hundred seventy-eight million, nine hundred sixty-seven thousand, eight hundred eighty-nine".