18859404500 has 24 divisors (see below), whose sum is σ = 41188940520. Its totient is φ = 7543761600.

The previous prime is 18859404467. The next prime is 18859404521. The reversal of 18859404500 is 540495881.

It can be written as a sum of positive squares in 4 ways, for example, as 1817146384 + 17042258116 = 42628^2 + 130546^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18858905 + ... + 18859904.

It is an arithmetic number, because the mean of its divisors is an integer number (1716205855).

Almost surely, 2^18859404500 is an apocalyptic number.

18859404500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18859404500 is an abundant number, since it is smaller than the sum of its proper divisors (22329536020).

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

18859404500 is a wasteful number, since it uses less digits than its factorization.

18859404500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37718828 (or 37718816 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 18859404500 in words is "eighteen billion, eight hundred fifty-nine million, four hundred four thousand, five hundred".