2158740 has 72 divisors (see below), whose sum is σ = 6683040. Its totient is φ = 563904.

The previous prime is 2158733. The next prime is 2158753. The reversal of 2158740 is 478512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11971 + ... + 12149.

It is an arithmetic number, because the mean of its divisors is an integer number (92820).

2^2158740 is an apocalyptic number.

2158740 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 2158740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3341520).

2158740 is an abundant number, since it is smaller than the sum of its proper divisors (4524300).

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

2158740 is a wasteful number, since it uses less digits than its factorization.

2158740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 2158740 is about 1469.2651224337. The cubic root of 2158740 is about 129.2409414416.

The spelling of 2158740 in words is "two million, one hundred fifty-eight thousand, seven hundred forty".