3865731 has 16 divisors (see below), whose sum is σ = 5372928. Its totient is φ = 2469600.

The previous prime is 3865691. The next prime is 3865733. The reversal of 3865731 is 1375683.

It is a happy number.

It is not a de Polignac number, because 3865731 - 2¹¹ = 3863683 is a prime.

It is a super-2 number, since 2×3865731² = 29887752328722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3865692 and 3865701.

It is not an unprimeable number, because it can be changed into a prime (3865733) 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 15 ways as a sum of consecutive naturals, for example, 18216 + ... + 18426.

It is an arithmetic number, because the mean of its divisors is an integer number (335808).

Almost surely, 2^3865731 is an apocalyptic number.

3865731 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3865731 is the 1244-th centered pentagonal number.

3865731 is a deficient number, since it is larger than the sum of its proper divisors (1507197).

3865731 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (3865730) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (442).

3865731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442.

The product of its digits is 15120, while the sum is 33.

The square root of 3865731 is about 1966.1462305739. The cubic root of 3865731 is about 156.9436962562.

The spelling of 3865731 in words is "three million, eight hundred sixty-five thousand, seven hundred thirty-one".