1129842 has 64 divisors (see below), whose sum is σ = 2976000. Its totient is φ = 317520.

The previous prime is 1129841. The next prime is 1129847. The reversal of 1129842 is 2489211.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1129841) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 18492 + ... + 18552.

It is an arithmetic number, because the mean of its divisors is an integer number (46500).

2^1129842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1129842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1488000).

1129842 is an abundant number, since it is smaller than the sum of its proper divisors (1846158).

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

1129842 is an equidigital number, since it uses as much as digits as its factorization.

1129842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 73 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1129842 is about 1062.9402617269. The cubic root of 1129842 is about 104.1531889407.

The spelling of 1129842 in words is "one million, one hundred twenty-nine thousand, eight hundred forty-two".