989742 has 16 divisors (see below), whose sum is σ = 2131920. Its totient is φ = 304512.

The previous prime is 989719. The next prime is 989743. The reversal of 989742 is 247989.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 989742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989743) by changing a digit.

989742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6267 + ... + 6422.

It is an arithmetic number, because the mean of its divisors is an integer number (133245).

2⁹⁸⁹⁷⁴² is an apocalyptic number.

989742 is an abundant number, since it is smaller than the sum of its proper divisors (1142178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989742 is a wasteful number, since it uses less digits than its factorization.

989742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12707.

The product of its digits is 36288, while the sum is 39.

The square root of 989742 is about 994.8577787805. The cubic root of 989742 is about 99.6568907737.

The spelling of 989742 in words is "nine hundred eighty-nine thousand, seven hundred forty-two".