978872489 has 8 divisors (see below), whose sum is σ = 1132872960. Its totient is φ = 828412416.

The previous prime is 978872473. The next prime is 978872491. The reversal of 978872489 is 984278879.

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

It is a cyclic number.

It is not a de Polignac number, because 978872489 - 2⁴ = 978872473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978872459) 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, 884504 + ... + 885609.

It is an arithmetic number, because the mean of its divisors is an integer number (141609120).

Almost surely, 2^978872489 is an apocalyptic number.

It is an amenable number.

978872489 is a deficient number, since it is larger than the sum of its proper divisors (154000471).

978872489 is a wasteful number, since it uses less digits than its factorization.

978872489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770199.

The product of its digits is 16257024, while the sum is 62.

The square root of 978872489 is about 31286.9379933544. The cubic root of 978872489 is about 992.9073090034.

The spelling of 978872489 in words is "nine hundred seventy-eight million, eight hundred seventy-two thousand, four hundred eighty-nine".