2861687 has 4 divisors (see below), whose sum is σ = 2872296. Its totient is φ = 2851080.

The previous prime is 2861671. The next prime is 2861699. The reversal of 2861687 is 7861682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7861682 = 2 ⋅3930841.

It is a cyclic number.

It is not a de Polignac number, because 2861687 - 2⁴ = 2861671 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2861687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861657) 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, 4889 + ... + 5442.

It is an arithmetic number, because the mean of its divisors is an integer number (718074).

2^2861687 is an apocalyptic number.

2861687 is a deficient number, since it is larger than the sum of its proper divisors (10609).

2861687 is a wasteful number, since it uses less digits than its factorization.

2861687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10608.

The product of its digits is 32256, while the sum is 38.

The square root of 2861687 is about 1691.6521510050. The cubic root of 2861687 is about 141.9735287560.

The spelling of 2861687 in words is "two million, eight hundred sixty-one thousand, six hundred eighty-seven".