3998133521 has 8 divisors (see below), whose sum is σ = 4024792800. Its totient is φ = 3971554048.

The previous prime is 3998133511. The next prime is 3998133533. The reversal of 3998133521 is 1253318993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3998133521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998133511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82310 + ... + 121536.

It is an arithmetic number, because the mean of its divisors is an integer number (503099100).

Almost surely, 2^3998133521 is an apocalyptic number.

It is an amenable number.

3998133521 is a deficient number, since it is larger than the sum of its proper divisors (26659279).

3998133521 is a wasteful number, since it uses less digits than its factorization.

3998133521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39903.

The product of its digits is 174960, while the sum is 44.

The square root of 3998133521 is about 63230.7956695153. The cubic root of 3998133521 is about 1587.1541093274.

The spelling of 3998133521 in words is "three billion, nine hundred ninety-eight million, one hundred thirty-three thousand, five hundred twenty-one".