2158920 has 64 divisors (see below), whose sum is σ = 7200000. Its totient is φ = 575424.

The previous prime is 2158909. The next prime is 2158921. The reversal of 2158920 is 298512.

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 (2158921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81 + ... + 2079.

It is an arithmetic number, because the mean of its divisors is an integer number (112500).

2^2158920 is an apocalyptic number.

2158920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2158920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3600000).

2158920 is an abundant number, since it is smaller than the sum of its proper divisors (5041080).

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

2158920 is a wasteful number, since it uses less digits than its factorization.

2158920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019 (or 2009 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 2158920 is about 1469.3263762691. The cubic root of 2158920 is about 129.2445334633.

It can be divided in two parts, 21589 and 20, that added together give a square (21609 = 147²).

The spelling of 2158920 in words is "two million, one hundred fifty-eight thousand, nine hundred twenty".