989478 has 24 divisors (see below), whose sum is σ = 2450448. Its totient is φ = 282672.

The previous prime is 989477. The next prime is 989479. The reversal of 989478 is 874989.

989478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (989477) and next prime (989479).

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989478.

It is not an unprimeable number, because it can be changed into a prime (989477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3801 + ... + 4052.

It is an arithmetic number, because the mean of its divisors is an integer number (102102).

2⁹⁸⁹⁴⁷⁸ is an apocalyptic number.

989478 is an abundant number, since it is smaller than the sum of its proper divisors (1460970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989478 is a wasteful number, since it uses less digits than its factorization.

989478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7868 (or 7865 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 989478 is about 994.7250876498. The cubic root of 989478 is about 99.6480292863.

The spelling of 989478 in words is "nine hundred eighty-nine thousand, four hundred seventy-eight".