2158542 has 32 divisors (see below), whose sum is σ = 4872960. Its totient is φ = 708120.

The previous prime is 2158523. The next prime is 2158547. The reversal of 2158542 is 2458512.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158547) 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 15 ways as a sum of consecutive naturals, for example, 3553 + ... + 4115.

It is an arithmetic number, because the mean of its divisors is an integer number (152280).

2^2158542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2158542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2436480).

2158542 is an abundant number, since it is smaller than the sum of its proper divisors (2714418).

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

2158542 is a wasteful number, since it uses less digits than its factorization.

2158542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 639 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 2158542 is about 1469.1977402651. The cubic root of 2158542 is about 129.2369899870.

The spelling of 2158542 in words is "two million, one hundred fifty-eight thousand, five hundred forty-two".