18481238 has 4 divisors (see below), whose sum is σ = 27721860. Its totient is φ = 9240618.

The previous prime is 18481223. The next prime is 18481249. The reversal of 18481238 is 83218481.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 18481198 and 18481207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4620308 + ... + 4620311.

It is an arithmetic number, because the mean of its divisors is an integer number (6930465).

Almost surely, 2^18481238 is an apocalyptic number.

18481238 is a deficient number, since it is larger than the sum of its proper divisors (9240622).

18481238 is an equidigital number, since it uses as much as digits as its factorization.

18481238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9240621.

The product of its digits is 12288, while the sum is 35.

The square root of 18481238 is about 4298.9810420610. The cubic root of 18481238 is about 264.3891853220.

The spelling of 18481238 in words is "eighteen million, four hundred eighty-one thousand, two hundred thirty-eight".