3865657 has 4 divisors (see below), whose sum is σ = 3955600. Its totient is φ = 3775716.

The previous prime is 3865637. The next prime is 3865663. The reversal of 3865657 is 7565683.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7565683 = 227 ⋅33329.

It is a cyclic number.

It is not a de Polignac number, because 3865657 - 2⁷ = 3865529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3865637) 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, 44907 + ... + 44992.

It is an arithmetic number, because the mean of its divisors is an integer number (988900).

Almost surely, 2^3865657 is an apocalyptic number.

It is an amenable number.

3865657 is a deficient number, since it is larger than the sum of its proper divisors (89943).

3865657 is an equidigital number, since it uses as much as digits as its factorization.

3865657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89942.

The product of its digits is 151200, while the sum is 40.

The square root of 3865657 is about 1966.1274119446. The cubic root of 3865657 is about 156.9426948149.

The spelling of 3865657 in words is "three million, eight hundred sixty-five thousand, six hundred fifty-seven".