989775 has 36 divisors (see below), whose sum is σ = 1828008. Its totient is φ = 511680.

The previous prime is 989761. The next prime is 989777. The reversal of 989775 is 577989.

989775 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 989775 - 2⁵ = 989743 is a prime.

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

989775 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 989775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989777) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11884 + ... + 11966.

It is an arithmetic number, because the mean of its divisors is an integer number (50778).

2⁹⁸⁹⁷⁷⁵ is an apocalyptic number.

989775 is a deficient number, since it is larger than the sum of its proper divisors (838233).

989775 is a wasteful number, since it uses less digits than its factorization.

989775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 144 counting only the distinct ones).

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

The square root of 989775 is about 994.8743639274. The cubic root of 989775 is about 99.6579983488.

It can be divided in two parts, 989 and 775, that added together give a square (1764 = 42²).

The spelling of 989775 in words is "nine hundred eighty-nine thousand, seven hundred seventy-five".