18712538 has 8 divisors (see below), whose sum is σ = 30227988. Its totient is φ = 8636544.

The previous prime is 18712537. The next prime is 18712541. The reversal of 18712538 is 83521781.

It can be written as a sum of positive squares in 2 ways, for example, as 18344089 + 368449 = 4283^2 + 607^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18712498 and 18712507.

It is not an unprimeable number, because it can be changed into a prime (18712531) 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, 359831 + ... + 359882.

Almost surely, 2^18712538 is an apocalyptic number.

18712538 is a deficient number, since it is larger than the sum of its proper divisors (11515450).

18712538 is a wasteful number, since it uses less digits than its factorization.

18712538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719728.

The product of its digits is 13440, while the sum is 35.

The square root of 18712538 is about 4325.7991169263. The cubic root of 18712538 is about 265.4875940404.

The spelling of 18712538 in words is "eighteen million, seven hundred twelve thousand, five hundred thirty-eight".