3986749 has 8 divisors (see below), whose sum is σ = 4353272. Its totient is φ = 3628800.

The previous prime is 3986747. The next prime is 3986761. The reversal of 3986749 is 9476893.

It can be written as a sum of positive squares in 4 ways, for example, as 6724 + 3980025 = 82^2 + 1995^2 .

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 3986749 - 2¹ = 3986747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3986699 and 3986708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3986747) 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, 1152 + ... + 3049.

It is an arithmetic number, because the mean of its divisors is an integer number (544159).

Almost surely, 2^3986749 is an apocalyptic number.

It is an amenable number.

3986749 is a deficient number, since it is larger than the sum of its proper divisors (366523).

3986749 is a wasteful number, since it uses less digits than its factorization.

3986749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287.

The product of its digits is 326592, while the sum is 46.

The square root of 3986749 is about 1996.6845018680. The cubic root of 3986749 is about 158.5646225160.

The spelling of 3986749 in words is "three million, nine hundred eighty-six thousand, seven hundred forty-nine".