3815649 has 6 divisors (see below), whose sum is σ = 5511506. Its totient is φ = 2543760.

The previous prime is 3815641. The next prime is 3815653. The reversal of 3815649 is 9465183.

3815649 is a `hidden beast` number, since 3 + 8 + 1 + 5 + 649 = 666.

3815649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 186624 = 1905^2 + 432^2 .

It is not a de Polignac number, because 3815649 - 2³ = 3815641 is a prime.

It is a Duffinian number.

3815649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3815641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211972 + ... + 211989.

Almost surely, 2^3815649 is an apocalyptic number.

It is an amenable number.

3815649 is a deficient number, since it is larger than the sum of its proper divisors (1695857).

3815649 is a wasteful number, since it uses less digits than its factorization.

3815649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423967 (or 423964 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 3815649 is about 1953.3686288051. The cubic root of 3815649 is about 156.2629932662.

The spelling of 3815649 in words is "three million, eight hundred fifteen thousand, six hundred forty-nine".