3865949 has 6 divisors (see below), whose sum is σ = 4080510. Its totient is φ = 3662136.

The previous prime is 3865943. The next prime is 3865951. The reversal of 3865949 is 9495683.

It can be written as a sum of positive squares in only one way, i.e., 3829849 + 36100 = 1957^2 + 190^2 .

It is not a de Polignac number, because 3865949 - 2⁴ = 3865933 is a prime.

It is a super-3 number, since 3×3865949³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4994 + ... + 5715.

It is an arithmetic number, because the mean of its divisors is an integer number (680085).

Almost surely, 2^3865949 is an apocalyptic number.

It is an amenable number.

3865949 is a deficient number, since it is larger than the sum of its proper divisors (214561).

3865949 is a wasteful number, since it uses less digits than its factorization.

3865949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10747 (or 10728 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The square root of 3865949 is about 1966.2016681917. The cubic root of 3865949 is about 156.9466463737.

The spelling of 3865949 in words is "three million, eight hundred sixty-five thousand, nine hundred forty-nine".