989409 has 4 divisors (see below), whose sum is σ = 1319216. Its totient is φ = 659604.

The previous prime is 989381. The next prime is 989411. The reversal of 989409 is 904989.

989409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 989409 - 2⁵ = 989377 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164899 + ... + 164904.

It is an arithmetic number, because the mean of its divisors is an integer number (329804).

2⁹⁸⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

989409 is a deficient number, since it is larger than the sum of its proper divisors (329807).

989409 is a wasteful number, since it uses less digits than its factorization.

989409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329806.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 989409 is about 994.6904040957. The cubic root of 989409 is about 99.6457129559.

The spelling of 989409 in words is "nine hundred eighty-nine thousand, four hundred nine".