989813 has 4 divisors (see below), whose sum is σ = 1079808. Its totient is φ = 899820.

The previous prime is 989803. The next prime is 989827. The reversal of 989813 is 318989.

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 a cyclic number.

It is not a de Polignac number, because 989813 - 2⁴ = 989797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989803) 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, 44981 + ... + 45002.

It is an arithmetic number, because the mean of its divisors is an integer number (269952).

2⁹⁸⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

989813 is a deficient number, since it is larger than the sum of its proper divisors (89995).

989813 is a wasteful number, since it uses less digits than its factorization.

989813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89994.

The product of its digits is 15552, while the sum is 38.

The square root of 989813 is about 994.8934616330. The cubic root of 989813 is about 99.6592737078.

The spelling of 989813 in words is "nine hundred eighty-nine thousand, eight hundred thirteen".