3851986 has 4 divisors (see below), whose sum is σ = 5777982. Its totient is φ = 1925992.

The previous prime is 3851977. The next prime is 3851989. The reversal of 3851986 is 6891583.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6891583 = 37 ⋅186259.

It can be written as a sum of positive squares in only one way, i.e., 2996361 + 855625 = 1731^2 + 925^2 .

It is a super-2 number, since 2×3851986² = 29675592288392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3851989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 962995 + ... + 962998.

Almost surely, 2^3851986 is an apocalyptic number.

3851986 is a deficient number, since it is larger than the sum of its proper divisors (1925996).

3851986 is a wasteful number, since it uses less digits than its factorization.

3851986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925995.

The product of its digits is 51840, while the sum is 40.

The square root of 3851986 is about 1962.6477014482. The cubic root of 3851986 is about 156.7574655992.

The spelling of 3851986 in words is "three million, eight hundred fifty-one thousand, nine hundred eighty-six".