9789942 has 8 divisors (see below), whose sum is σ = 19579896. Its totient is φ = 3263312.

The previous prime is 9789937. The next prime is 9789947. The reversal of 9789942 is 2499879.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9789937) and next prime (9789947).

It is a sphenic number, since it is the product of 3 distinct primes.

9789942 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 9789891 and 9789900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9789947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815823 + ... + 815834.

It is an arithmetic number, because the mean of its divisors is an integer number (2447487).

Almost surely, 2^9789942 is an apocalyptic number.

9789942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9789942 is a wasteful number, since it uses less digits than its factorization.

9789942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631662.

The product of its digits is 326592, while the sum is 48.

The square root of 9789942 is about 3128.8883009785. Note that the first 3 decimals coincide. The cubic root of 9789942 is about 213.9242606169.

It can be divided in two parts, 9789 and 942, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 9789942 in words is "nine million, seven hundred eighty-nine thousand, nine hundred forty-two".