2158842 has 32 divisors (see below), whose sum is σ = 5040000. Its totient is φ = 616224.

The previous prime is 2158841. The next prime is 2158843. The reversal of 2158842 is 2488512.

2158842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2158841) and next prime (2158843).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2158841) 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 15 ways as a sum of consecutive naturals, for example, 1534 + ... + 2582.

It is an arithmetic number, because the mean of its divisors is an integer number (157500).

2^2158842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2158842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2520000).

2158842 is an abundant number, since it is smaller than the sum of its proper divisors (2881158).

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

2158842 is a wasteful number, since it uses less digits than its factorization.

2158842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075 (or 1061 counting only the distinct ones).

The product of its digits is 5120, while the sum is 30.

The square root of 2158842 is about 1469.2998332539. The cubic root of 2158842 is about 129.2429769451.

The spelling of 2158842 in words is "two million, one hundred fifty-eight thousand, eight hundred forty-two".