3909897 has 16 divisors (see below), whose sum is σ = 5832000. Its totient is φ = 2588832.

The previous prime is 3909889. The next prime is 3909907. The reversal of 3909897 is 7989093.

It is a happy number.

3909897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3909897 - 2³ = 3909889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3909817) 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 15 ways as a sum of consecutive naturals, for example, 4429 + ... + 5237.

It is an arithmetic number, because the mean of its divisors is an integer number (364500).

Almost surely, 2^3909897 is an apocalyptic number.

It is an amenable number.

3909897 is a deficient number, since it is larger than the sum of its proper divisors (1922103).

3909897 is a wasteful number, since it uses less digits than its factorization.

3909897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 3909897 is about 1977.3459484875. The cubic root of 3909897 is about 157.5391286003.

The spelling of 3909897 in words is "three million, nine hundred nine thousand, eight hundred ninety-seven".