2175840 has 72 divisors (see below), whose sum is σ = 7429968. Its totient is φ = 579840.

The previous prime is 2175827. The next prime is 2175851. The reversal of 2175840 is 485712.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685 + ... + 2195.

It is an arithmetic number, because the mean of its divisors is an integer number (103194).

2^2175840 is an apocalyptic number.

2175840 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 2175840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3714984).

2175840 is an abundant number, since it is smaller than the sum of its proper divisors (5254128).

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

2175840 is a wasteful number, since it uses less digits than its factorization.

2175840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1521 counting only the distinct ones).

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

The square root of 2175840 is about 1475.0728795554. The cubic root of 2175840 is about 129.5812958832.

The spelling of 2175840 in words is "two million, one hundred seventy-five thousand, eight hundred forty".