3865261 has 4 divisors (see below), whose sum is σ = 3879900. Its totient is φ = 3850624.

The previous prime is 3865247. The next prime is 3865283. The reversal of 3865261 is 1625683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1625683 = 47 ⋅34589.

It can be written as a sum of positive squares in 2 ways, for example, as 1142761 + 2722500 = 1069^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 3865261 - 2⁵ = 3865229 is a prime.

It is a Duffinian number.

3865261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865231) 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, 6916 + ... + 7453.

It is an arithmetic number, because the mean of its divisors is an integer number (969975).

Almost surely, 2^3865261 is an apocalyptic number.

It is an amenable number.

3865261 is a deficient number, since it is larger than the sum of its proper divisors (14639).

3865261 is a wasteful number, since it uses less digits than its factorization.

3865261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14638.

The product of its digits is 8640, while the sum is 31.

The square root of 3865261 is about 1966.0267037861. The cubic root of 3865261 is about 156.9373355336.

The spelling of 3865261 in words is "three million, eight hundred sixty-five thousand, two hundred sixty-one".