989731 has 4 divisors (see below), whose sum is σ = 1012792. Its totient is φ = 966672.

The previous prime is 989719. The next prime is 989743. The reversal of 989731 is 137989.

989731 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 an emirpimes, since its reverse is a distinct semiprime: 137989 = 17 ⋅8117.

It is an interprime number because it is at equal distance from previous prime (989719) and next prime (989743).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989731 is a prime.

It is a super-2 number, since 2×989731² = 1959134904722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989761) 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, 11466 + ... + 11551.

It is an arithmetic number, because the mean of its divisors is an integer number (253198).

2⁹⁸⁹⁷³¹ is an apocalyptic number.

989731 is a deficient number, since it is larger than the sum of its proper divisors (23061).

989731 is a wasteful number, since it uses less digits than its factorization.

989731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23060.

The product of its digits is 13608, while the sum is 37.

The square root of 989731 is about 994.8522503367. The cubic root of 989731 is about 99.6565215765.

The spelling of 989731 in words is "nine hundred eighty-nine thousand, seven hundred thirty-one".