7861687 has 8 divisors (see below), whose sum is σ = 8334000. Its totient is φ = 7395264.

The previous prime is 7861673. The next prime is 7861717.

7861687 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7861687 - 2¹¹ = 7859639 is a prime.

It is a super-2 number, since 2×7861687² = 123612244971938, which contains 22 as substring.

It is a Duffinian number.

7861687 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7861657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1443 + ... + 4219.

It is an arithmetic number, because the mean of its divisors is an integer number (1041750).

Almost surely, 2^7861687 is an apocalyptic number.

7861687 is a deficient number, since it is larger than the sum of its proper divisors (472313).

7861687 is a wasteful number, since it uses less digits than its factorization.

7861687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945.

The product of its digits is 112896, while the sum is 43.

The square root of 7861687 is about 2803.8700041193. The cubic root of 7861687 is about 198.8406845900.

The spelling of 7861687 in words is "seven million, eight hundred sixty-one thousand, six hundred eighty-seven".