3899569921 has 8 divisors (see below), whose sum is σ = 4200059304. Its totient is φ = 3599155200.

The previous prime is 3899569909. The next prime is 3899569943. The reversal of 3899569921 is 1299659983.

3899569921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 192099600 + 3707470321 = 13860^2 + 60889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3899569921 - 2⁵ = 3899569889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3899569921.

It is not an unprimeable number, because it can be changed into a prime (3899569951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139521 + ... + 165121.

It is an arithmetic number, because the mean of its divisors is an integer number (525007413).

Almost surely, 2^3899569921 is an apocalyptic number.

It is an amenable number.

3899569921 is a deficient number, since it is larger than the sum of its proper divisors (300489383).

3899569921 is a wasteful number, since it uses less digits than its factorization.

3899569921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37331.

The product of its digits is 9447840, while the sum is 61.

The square root of 3899569921 is about 62446.5365012344. The cubic root of 3899569921 is about 1574.0030537741.

The spelling of 3899569921 in words is "three billion, eight hundred ninety-nine million, five hundred sixty-nine thousand, nine hundred twenty-one".