19255265238 has 64 divisors (see below), whose sum is σ = 44150591232. Its totient is φ = 5545169280.

The previous prime is 19255265231. The next prime is 19255265243. The reversal of 19255265238 is 83256255291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19255265231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13320 + ... + 196692.

It is an arithmetic number, because the mean of its divisors is an integer number (689852988).

Almost surely, 2^19255265238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19255265238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22075295616).

19255265238 is an abundant number, since it is smaller than the sum of its proper divisors (24895325994).

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

19255265238 is a wasteful number, since it uses less digits than its factorization.

19255265238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183469.

The product of its digits is 1296000, while the sum is 48.

The spelling of 19255265238 in words is "nineteen billion, two hundred fifty-five million, two hundred sixty-five thousand, two hundred thirty-eight".