18225812 has 24 divisors (see below), whose sum is σ = 35646912. Its totient is φ = 8081600.

The previous prime is 18225811. The next prime is 18225839. The reversal of 18225812 is 21852281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225811) 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, 3248 + ... + 6855.

It is an arithmetic number, because the mean of its divisors is an integer number (1485288).

Almost surely, 2^18225812 is an apocalyptic number.

It is an amenable number.

18225812 is a deficient number, since it is larger than the sum of its proper divisors (17421100).

18225812 is a wasteful number, since it uses less digits than its factorization.

18225812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10159 (or 10157 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 18225812 is about 4269.1699427406. The cubic root of 18225812 is about 263.1655046978.

The spelling of 18225812 in words is "eighteen million, two hundred twenty-five thousand, eight hundred twelve".