2187840 has 112 divisors (see below), whose sum is σ = 7242048. Its totient is φ = 559104.

The previous prime is 2187833. The next prime is 2187851. The reversal of 2187840 is 487812.

It is a super-4 number, since 4×2187840⁴ (a number of 26 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2187798 and 2187807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41254 + ... + 41306.

2^2187840 is an apocalyptic number.

2187840 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 2187840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3621024).

2187840 is an abundant number, since it is smaller than the sum of its proper divisors (5054208).

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

2187840 is a wasteful number, since it uses less digits than its factorization.

2187840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 2187840 is about 1479.1348822876. The cubic root of 2187840 is about 129.8190777140.

The spelling of 2187840 in words is "two million, one hundred eighty-seven thousand, eight hundred forty".