3931687 has 2 divisors, whose sum is σ = 3931688. Its totient is φ = 3931686.

The previous prime is 3931667. The next prime is 3931693. The reversal of 3931687 is 7861393.

It is a strong prime.

It is an emirp because it is prime and its reverse (7861393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3931687 - 2¹⁵ = 3898919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3931667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1965843 + 1965844.

It is an arithmetic number, because the mean of its divisors is an integer number (1965844).

Almost surely, 2^3931687 is an apocalyptic number.

3931687 is a deficient number, since it is larger than the sum of its proper divisors (1).

3931687 is an equidigital number, since it uses as much as digits as its factorization.

3931687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 3931687 is about 1982.8482039733. The cubic root of 3931687 is about 157.8312437365.

It can be divided in two parts, 393 and 1687, that added together give a triangular number (2080 = T₆₄).

The spelling of 3931687 in words is "three million, nine hundred thirty-one thousand, six hundred eighty-seven".