989691 has 16 divisors (see below), whose sum is σ = 1411200. Its totient is φ = 615168.

The previous prime is 989687. The next prime is 989719. The reversal of 989691 is 196989.

It is not a de Polignac number, because 989691 - 2² = 989687 is a prime.

989691 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989691.

It is not an unprimeable number, because it can be changed into a prime (989641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5440 + ... + 5618.

It is an arithmetic number, because the mean of its divisors is an integer number (88200).

2⁹⁸⁹⁶⁹¹ is an apocalyptic number.

989691 is a deficient number, since it is larger than the sum of its proper divisors (421509).

989691 is a wasteful number, since it uses less digits than its factorization.

989691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298.

The product of its digits is 34992, while the sum is 42.

The square root of 989691 is about 994.8321466459. The cubic root of 989691 is about 99.6551790182.

The spelling of 989691 in words is "nine hundred eighty-nine thousand, six hundred ninety-one".