3865406949 has 12 divisors (see below), whose sum is σ = 5877227200. Its totient is φ = 2441309544.

The previous prime is 3865406929. The next prime is 3865406981. The reversal of 3865406949 is 9496045683.

3865406949 is a `hidden beast` number, since 3 + 8 + 6 + 540 + 6 + 94 + 9 = 666.

It is not a de Polignac number, because 3865406949 - 2⁷ = 3865406821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3865406895 and 3865406904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865406929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11302189 + ... + 11302530.

Almost surely, 2^3865406949 is an apocalyptic number.

It is an amenable number.

3865406949 is a deficient number, since it is larger than the sum of its proper divisors (2011820251).

3865406949 is a wasteful number, since it uses less digits than its factorization.

3865406949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22604744 (or 22604741 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The square root of 3865406949 is about 62172.3970022067. The cubic root of 3865406949 is about 1569.3931078266.

The spelling of 3865406949 in words is "three billion, eight hundred sixty-five million, four hundred six thousand, nine hundred forty-nine".