3765281 has 4 divisors (see below), whose sum is σ = 4054932. Its totient is φ = 3475632.

The previous prime is 3765271. The next prime is 3765299. The reversal of 3765281 is 1825673.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 3150625 = 784^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 3765281 - 2¹⁴ = 3748897 is a prime.

It is a super-2 number, since 2×3765281² = 28354682017922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3765241) 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, 144806 + ... + 144831.

It is an arithmetic number, because the mean of its divisors is an integer number (1013733).

Almost surely, 2^3765281 is an apocalyptic number.

It is an amenable number.

3765281 is a deficient number, since it is larger than the sum of its proper divisors (289651).

3765281 is a wasteful number, since it uses less digits than its factorization.

3765281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289650.

The product of its digits is 10080, while the sum is 32.

The square root of 3765281 is about 1940.4331990563. The cubic root of 3765281 is about 155.5723687231.

The spelling of 3765281 in words is "three million, seven hundred sixty-five thousand, two hundred eighty-one".