3986731 has 4 divisors (see below), whose sum is σ = 4556272. Its totient is φ = 3417192.

The previous prime is 3986729. The next prime is 3986737. The reversal of 3986731 is 1376893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1376893 = 7 ⋅196699.

It is a cyclic number.

It is not a de Polignac number, because 3986731 - 2¹ = 3986729 is a prime.

It is a super-2 number, since 2×3986731² = 31788048132722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3986737) by changing a digit.

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, 284760 + ... + 284773.

It is an arithmetic number, because the mean of its divisors is an integer number (1139068).

Almost surely, 2^3986731 is an apocalyptic number.

3986731 is a deficient number, since it is larger than the sum of its proper divisors (569541).

3986731 is an equidigital number, since it uses as much as digits as its factorization.

3986731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569540.

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

The square root of 3986731 is about 1996.6799943907. The cubic root of 3986731 is about 158.5643838782.

The spelling of 3986731 in words is "three million, nine hundred eighty-six thousand, seven hundred thirty-one".