3986849 has 4 divisors (see below), whose sum is σ = 4001940. Its totient is φ = 3971760.

The previous prime is 3986839. The next prime is 3986897. The reversal of 3986849 is 9486893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9486893 = 13 ⋅729761.

It can be written as a sum of positive squares in 2 ways, for example, as 889249 + 3097600 = 943^2 + 1760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3986849 is a prime.

It is a super-3 number, since 3×3986849³ (a number of 21 digits) contains 333 as substring.

It is a d-powerful number, because it can be written as 3¹¹ + 9² + 8⁵ + 6⁸ + 8⁷ + 4 + 9² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3986809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7142 + ... + 7679.

It is an arithmetic number, because the mean of its divisors is an integer number (1000485).

Almost surely, 2^3986849 is an apocalyptic number.

It is an amenable number.

3986849 is a deficient number, since it is larger than the sum of its proper divisors (15091).

3986849 is a wasteful number, since it uses less digits than its factorization.

3986849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15090.

The product of its digits is 373248, while the sum is 47.

The square root of 3986849 is about 1996.7095432236. The cubic root of 3986849 is about 158.5659482687.

The spelling of 3986849 in words is "three million, nine hundred eighty-six thousand, eight hundred forty-nine".