18538206040 has 32 divisors (see below), whose sum is σ = 42213512880. Its totient is φ = 7325940352.

The previous prime is 18538206031. The next prime is 18538206059. The reversal of 18538206040 is 4060283581.

It is a happy number.

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, 2788579 + ... + 2795218.

Almost surely, 2^18538206040 is an apocalyptic number.

18538206040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18538206040 is an abundant number, since it is smaller than the sum of its proper divisors (23675306840).

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

18538206040 is a wasteful number, since it uses less digits than its factorization.

18538206040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5583891 (or 5583887 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 18538206040 in words is "eighteen billion, five hundred thirty-eight million, two hundred six thousand, forty".