9781542 has 48 divisors (see below), whose sum is σ = 22941360. Its totient is φ = 3001536.

The previous prime is 9781529. The next prime is 9781549. The reversal of 9781542 is 2451879.

It is a junction number, because it is equal to n+sod(n) for n = 9781497 and 9781506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9781549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12268 + ... + 13040.

It is an arithmetic number, because the mean of its divisors is an integer number (477945).

Almost surely, 2^9781542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9781542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11470680).

9781542 is an abundant number, since it is smaller than the sum of its proper divisors (13159818).

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

9781542 is a wasteful number, since it uses less digits than its factorization.

9781542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 834 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 9781542 is about 3127.5456831196. The cubic root of 9781542 is about 213.8630590973.

The spelling of 9781542 in words is "nine million, seven hundred eighty-one thousand, five hundred forty-two".