18055538 has 8 divisors (see below), whose sum is σ = 27114588. Its totient is φ = 9017344.

The previous prime is 18055517. The next prime is 18055553. The reversal of 18055538 is 83555081.

It can be written as a sum of positive squares in 2 ways, for example, as 16785409 + 1270129 = 4097^2 + 1127^2 .

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 = 18055498 and 18055507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2831 + ... + 6642.

Almost surely, 2^18055538 is an apocalyptic number.

18055538 is a deficient number, since it is larger than the sum of its proper divisors (9059050).

18055538 is an equidigital number, since it uses as much as digits as its factorization.

18055538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10428.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 18055538 is about 4249.1808622369. The cubic root of 18055538 is about 262.3434010790.

The spelling of 18055538 in words is "eighteen million, fifty-five thousand, five hundred thirty-eight".