3871786 has 4 divisors (see below), whose sum is σ = 5807682. Its totient is φ = 1935892.

The previous prime is 3871783. The next prime is 3871787. The reversal of 3871786 is 6871783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6871783 = 137 ⋅50159.

It can be written as a sum of positive squares in only one way, i.e., 3682561 + 189225 = 1919^2 + 435^2 .

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 (3871781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 967945 + ... + 967948.

Almost surely, 2^3871786 is an apocalyptic number.

3871786 is a deficient number, since it is larger than the sum of its proper divisors (1935896).

3871786 is a wasteful number, since it uses less digits than its factorization.

3871786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935895.

The product of its digits is 56448, while the sum is 40.

The square root of 3871786 is about 1967.6854423408. The cubic root of 3871786 is about 157.0255952429.

It can be divided in two parts, 38 and 71786, that added together give a square (71824 = 268²).

The spelling of 3871786 in words is "three million, eight hundred seventy-one thousand, seven hundred eighty-six".