989405 has 8 divisors (see below), whose sum is σ = 1192632. Its totient is φ = 787968.

The previous prime is 989381. The next prime is 989411. The reversal of 989405 is 504989.

It can be written as a sum of positive squares in 4 ways, for example, as 88804 + 900601 = 298^2 + 949^2 .

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 989405 - 2⁶ = 989341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1937 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (149079).

2⁹⁸⁹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

989405 is a deficient number, since it is larger than the sum of its proper divisors (203227).

989405 is a wasteful number, since it uses less digits than its factorization.

989405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 989405 is about 994.6883934178. The cubic root of 989405 is about 99.6455786726.

Subtracting from 989405 its reverse (504989), we obtain a square (484416 = 696²).

The spelling of 989405 in words is "nine hundred eighty-nine thousand, four hundred five".