3765681 has 12 divisors (see below), whose sum is σ = 5462340. Its totient is φ = 2499840.

The previous prime is 3765673. The next prime is 3765689. The reversal of 3765681 is 1865673.

It is an interprime number because it is at equal distance from previous prime (3765673) and next prime (3765689).

It can be written as a sum of positive squares in 2 ways, for example, as 1648656 + 2117025 = 1284^2 + 1455^2 .

It is not a de Polignac number, because 3765681 - 2³ = 3765673 is a prime.

It is a super-2 number, since 2×3765681² = 28360706787522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

3765681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3765689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1785 + ... + 3273.

It is an arithmetic number, because the mean of its divisors is an integer number (455195).

Almost surely, 2^3765681 is an apocalyptic number.

It is an amenable number.

3765681 is a deficient number, since it is larger than the sum of its proper divisors (1696659).

3765681 is a wasteful number, since it uses less digits than its factorization.

3765681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776 (or 1773 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 3765681 is about 1940.5362660873. The cubic root of 3765681 is about 155.5778775412.

The spelling of 3765681 in words is "three million, seven hundred sixty-five thousand, six hundred eighty-one".