2180687 has 4 divisors (see below), whose sum is σ = 2295480. Its totient is φ = 2065896.

The previous prime is 2180683. The next prime is 2180693. The reversal of 2180687 is 7860812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2180687 - 2² = 2180683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57368 + ... + 57405.

It is an arithmetic number, because the mean of its divisors is an integer number (573870).

2^2180687 is an apocalyptic number.

2180687 is a deficient number, since it is larger than the sum of its proper divisors (114793).

2180687 is a wasteful number, since it uses less digits than its factorization.

2180687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114792.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 2180687 is about 1476.7149352532. The cubic root of 2180687 is about 129.6774449165.

It can be divided in two parts, 21 and 80687, that added together give a palindrome (80708).

The spelling of 2180687 in words is "two million, one hundred eighty thousand, six hundred eighty-seven".