18225838 has 4 divisors (see below), whose sum is σ = 27338760. Its totient is φ = 9112918.

The previous prime is 18225811. The next prime is 18225839. The reversal of 18225838 is 83852281.

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 = 18225797 and 18225806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4556458 + ... + 4556461.

It is an arithmetic number, because the mean of its divisors is an integer number (6834690).

Almost surely, 2^18225838 is an apocalyptic number.

18225838 is a deficient number, since it is larger than the sum of its proper divisors (9112922).

18225838 is an equidigital number, since it uses as much as digits as its factorization.

18225838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9112921.

The product of its digits is 30720, while the sum is 37.

The square root of 18225838 is about 4269.1729878280. The cubic root of 18225838 is about 263.1656298372.

The spelling of 18225838 in words is "eighteen million, two hundred twenty-five thousand, eight hundred thirty-eight".