19190436858 has 24 divisors (see below), whose sum is σ = 43013049300. Its totient is φ = 6176232384.

The previous prime is 19190436857. The next prime is 19190436899. The reversal of 19190436858 is 85863409191.

19190436858 is a `hidden beast` number, since 19 + 190 + 436 + 8 + 5 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19119422529 + 71014329 = 138273^2 + 8427^2 .

It is not an unprimeable number, because it can be changed into a prime (19190436857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18381123 + ... + 18382166.

Almost surely, 2^19190436858 is an apocalyptic number.

19190436858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19190436858 is an abundant number, since it is smaller than the sum of its proper divisors (23822612442).

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

19190436858 is a wasteful number, since it uses less digits than its factorization.

19190436858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36763326 (or 36763323 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 19190436858 in words is "nineteen billion, one hundred ninety million, four hundred thirty-six thousand, eight hundred fifty-eight".