18705234040 has 16 divisors (see below), whose sum is σ = 42086776680. Its totient is φ = 7482093600.

The previous prime is 18705233993. The next prime is 18705234043. The reversal of 18705234040 is 4043250781.

It is a junction number, because it is equal to n+sod(n) for n = 18705233987 and 18705234005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705234043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233815386 + ... + 233815465.

Almost surely, 2^18705234040 is an apocalyptic number.

18705234040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18705234040 is an abundant number, since it is smaller than the sum of its proper divisors (23381542640).

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

18705234040 is a wasteful number, since it uses less digits than its factorization.

18705234040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467630862 (or 467630858 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 18705234040 in words is "eighteen billion, seven hundred five million, two hundred thirty-four thousand, forty".