3909449568 has 24 divisors (see below), whose sum is σ = 10262305368. Its totient is φ = 1303149824.

The previous prime is 3909449561. The next prime is 3909449629. The reversal of 3909449568 is 8659449093.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909449561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20361621 + ... + 20361812.

It is an arithmetic number, because the mean of its divisors is an integer number (427596057).

Almost surely, 2^3909449568 is an apocalyptic number.

It is an amenable number.

3909449568 is an abundant number, since it is smaller than the sum of its proper divisors (6352855800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3909449568 is a wasteful number, since it uses less digits than its factorization.

3909449568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40723446 (or 40723438 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 57.

The square root of 3909449568 is about 62525.5913046810. The cubic root of 3909449568 is about 1575.3311900151.

The spelling of 3909449568 in words is "three billion, nine hundred nine million, four hundred forty-nine thousand, five hundred sixty-eight".