989000775 has 144 divisors (see below), whose sum is σ = 2135577600. Its totient is φ = 427956480.

The previous prime is 989000773. The next prime is 989000777. The reversal of 989000775 is 577000989.

It is an interprime number because it is at equal distance from previous prime (989000773) and next prime (989000777).

It is not a de Polignac number, because 989000775 - 2¹ = 989000773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 989000775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989000773) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2694642 + ... + 2695008.

It is an arithmetic number, because the mean of its divisors is an integer number (14830400).

Almost surely, 2^989000775 is an apocalyptic number.

989000775 is an abundant number, since it is smaller than the sum of its proper divisors (1146576825).

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

989000775 is a wasteful number, since it uses less digits than its factorization.

With its successor (989000776) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (478).

989000775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 989000775 is about 31448.3827088135. The cubic root of 989000775 is about 996.3200663662.

The spelling of 989000775 in words is "nine hundred eighty-nine million, seven hundred seventy-five", and thus it is an aban number.