3869521 has 4 divisors (see below), whose sum is σ = 4073200. Its totient is φ = 3665844.

The previous prime is 3869501. The next prime is 3869561. The reversal of 3869521 is 1259683.

3869521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 1259683 = 17 ⋅74099.

It is a cyclic number.

It is not a de Polignac number, because 3869521 - 2⁹ = 3869009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3869501) 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 3 ways as a sum of consecutive naturals, for example, 101811 + ... + 101848.

It is an arithmetic number, because the mean of its divisors is an integer number (1018300).

Almost surely, 2^3869521 is an apocalyptic number.

It is an amenable number.

3869521 is a deficient number, since it is larger than the sum of its proper divisors (203679).

3869521 is a wasteful number, since it uses less digits than its factorization.

3869521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203678.

The product of its digits is 12960, while the sum is 34.

The square root of 3869521 is about 1967.1098088312. The cubic root of 3869521 is about 156.9949692088.

The spelling of 3869521 in words is "three million, eight hundred sixty-nine thousand, five hundred twenty-one".