2158840 has 32 divisors (see below), whose sum is σ = 5016960. Its totient is φ = 835200.

The previous prime is 2158831. The next prime is 2158841. The reversal of 2158840 is 488512.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2158799 and 2158808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370 + ... + 2110.

It is an arithmetic number, because the mean of its divisors is an integer number (156780).

2^2158840 is an apocalyptic number.

2158840 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 2158840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2508480).

2158840 is an abundant number, since it is smaller than the sum of its proper divisors (2858120).

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

2158840 is a wasteful number, since it uses less digits than its factorization.

2158840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 2158840 is about 1469.2991526575. The cubic root of 2158840 is about 129.2429370338.

The spelling of 2158840 in words is "two million, one hundred fifty-eight thousand, eight hundred forty".