3969609 has 16 divisors (see below), whose sum is σ = 6076800. Its totient is φ = 2257920.

The previous prime is 3969601. The next prime is 3969611. The reversal of 3969609 is 9069693.

It is not a de Polignac number, because 3969609 - 2³ = 3969601 is a prime.

It is a super-2 number, since 2×3969609² = 31515591225762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3969601) 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, 8617 + ... + 9065.

It is an arithmetic number, because the mean of its divisors is an integer number (379800).

Almost surely, 2^3969609 is an apocalyptic number.

It is an amenable number.

3969609 is a deficient number, since it is larger than the sum of its proper divisors (2107191).

3969609 is a wasteful number, since it uses less digits than its factorization.

3969609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 3969609 is about 1992.3877634637. The cubic root of 3969609 is about 158.3370601770.

The spelling of 3969609 in words is "three million, nine hundred sixty-nine thousand, six hundred nine".