3986775 has 72 divisors (see below), whose sum is σ = 8124480. Its totient is φ = 1854720.

The previous prime is 3986771. The next prime is 3986783. The reversal of 3986775 is 5776893.

It is a happy number.

It is not a de Polignac number, because 3986775 - 2² = 3986771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (317520) is a multiple of the sum of its prime factors (105).

3986775 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3986775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3986771) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 84802 + ... + 84848.

It is an arithmetic number, because the mean of its divisors is an integer number (112840).

Almost surely, 2^3986775 is an apocalyptic number.

3986775 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

3986775 is a wasteful number, since it uses less digits than its factorization.

3986775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 97 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 3986775 is about 1996.6910126507. The cubic root of 3986775 is about 158.5649672139.

It can be divided in two parts, 3986 and 775, that added together give a square (4761 = 69²).

The spelling of 3986775 in words is "three million, nine hundred eighty-six thousand, seven hundred seventy-five".