19122999858 has 80 divisors (see below), whose sum is σ = 44084741184. Its totient is φ = 6191212320.

The previous prime is 19122999817. The next prime is 19122999877. The reversal of 19122999858 is 85899922191.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19122999795 and 19122999804.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 3875653 + ... + 3880583.

Almost surely, 2^19122999858 is an apocalyptic number.

19122999858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19122999858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22042370592).

19122999858 is an abundant number, since it is smaller than the sum of its proper divisors (24961741326).

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

19122999858 is a wasteful number, since it uses less digits than its factorization.

19122999858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629 (or 5620 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 63.

The spelling of 19122999858 in words is "nineteen billion, one hundred twenty-two million, nine hundred ninety-nine thousand, eight hundred fifty-eight".