3909689 has 16 divisors (see below), whose sum is σ = 4730880. Its totient is φ = 3160080.

The previous prime is 3909671. The next prime is 3909691. The reversal of 3909689 is 9869093.

It is not a de Polignac number, because 3909689 - 2²⁰ = 2861113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3909289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9122 + ... + 9540.

It is an arithmetic number, because the mean of its divisors is an integer number (295680).

Almost surely, 2^3909689 is an apocalyptic number.

It is an amenable number.

3909689 is a deficient number, since it is larger than the sum of its proper divisors (821191).

3909689 is a wasteful number, since it uses less digits than its factorization.

3909689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 3909689 is about 1977.2933520345. The cubic root of 3909689 is about 157.5363349444.

The spelling of 3909689 in words is "three million, nine hundred nine thousand, six hundred eighty-nine".