18716538 has 16 divisors (see below), whose sum is σ = 37820160. Its totient is φ = 6174336.

The previous prime is 18716531. The next prime is 18716557. The reversal of 18716538 is 83561781.

It is a junction number, because it is equal to n+sod(n) for n = 18716496 and 18716505.

It is not an unprimeable number, because it can be changed into a prime (18716531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15498 + ... + 16661.

It is an arithmetic number, because the mean of its divisors is an integer number (2363760).

Almost surely, 2^18716538 is an apocalyptic number.

18716538 is an abundant number, since it is smaller than the sum of its proper divisors (19103622).

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

18716538 is a wasteful number, since it uses less digits than its factorization.

18716538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32261.

The product of its digits is 40320, while the sum is 39.

The square root of 18716538 is about 4326.2614345414. The cubic root of 18716538 is about 265.5065096059.

The spelling of 18716538 in words is "eighteen million, seven hundred sixteen thousand, five hundred thirty-eight".