2087840 has 24 divisors (see below), whose sum is σ = 4932900. Its totient is φ = 835072.

The previous prime is 2087837. The next prime is 2087857. The reversal of 2087840 is 487802.

It can be written as a sum of positive squares in 2 ways, for example, as 2085136 + 2704 = 1444^2 + 52^2 .

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6365 + ... + 6684.

2^2087840 is an apocalyptic number.

2087840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2087840 is an abundant number, since it is smaller than the sum of its proper divisors (2845060).

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

2087840 is a wasteful number, since it uses less digits than its factorization.

2087840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13064 (or 13056 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 2087840 is about 1444.9359847412. The cubic root of 2087840 is about 127.8102657712.

The spelling of 2087840 in words is "two million, eighty-seven thousand, eight hundred forty".