981789 has 4 divisors (see below), whose sum is σ = 1309056. Its totient is φ = 654524.

The previous prime is 981769. The next prime is 981797. The reversal of 981789 is 987189.

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 981789 - 2¹² = 977693 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 981789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981769) 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, 163629 + ... + 163634.

It is an arithmetic number, because the mean of its divisors is an integer number (327264).

2⁹⁸¹⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

981789 is a deficient number, since it is larger than the sum of its proper divisors (327267).

981789 is a wasteful number, since it uses less digits than its factorization.

981789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327266.

The product of its digits is 36288, while the sum is 42.

The square root of 981789 is about 990.8526631139. The cubic root of 981789 is about 99.3892440323.

It can be divided in two parts, 981 and 789, that added together give a triangular number (1770 = T₅₉).

The spelling of 981789 in words is "nine hundred eighty-one thousand, seven hundred eighty-nine".