19833933889 has 81 divisors (see below), whose sum is σ = 26656410753. Its totient is φ = 14702965200.

The previous prime is 19833933887. The next prime is 19833933929. The reversal of 19833933889 is 98833933891.

The square root of 19833933889 is 140833.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 19833933889 - 2¹ = 19833933887 is a prime.

Its product of digits (30233088) is a multiple of the sum of its prime divisors (108).

It is a self number, because there is not a number n which added to its sum of digits gives 19833933889.

It is not an unprimeable number, because it can be changed into a prime (19833933887) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 336168342 + ... + 336168400.

Almost surely, 2^19833933889 is an apocalyptic number.

19833933889 is the 140833-rd square number.

19833933889 is the 70417-th centered octagonal number.

It is an amenable number.

19833933889 is a deficient number, since it is larger than the sum of its proper divisors (6822476864).

19833933889 is an equidigital number, since it uses as much as digits as its factorization.

19833933889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 108 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 64.

Multiplying 19833933889 by its sum of digits (64), we get a square (1269371768896 = 1126664²).

The spelling of 19833933889 in words is "nineteen billion, eight hundred thirty-three million, nine hundred thirty-three thousand, eight hundred eighty-nine".