18630818 has 8 divisors (see below), whose sum is σ = 28909980. Its totient is φ = 8994160.

The previous prime is 18630809. The next prime is 18630823. The reversal of 18630818 is 81803681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16507969 + 2122849 = 4063^2 + 1457^2 .

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

It is a super-3 number, since 3×18630818³ (a number of 23 digits) contains 333 as substring.

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, 160553 + ... + 160668.

Almost surely, 2^18630818 is an apocalyptic number.

18630818 is a deficient number, since it is larger than the sum of its proper divisors (10279162).

18630818 is a wasteful number, since it uses less digits than its factorization.

18630818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321252.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18630818 is about 4316.3431281584. The cubic root of 18630818 is about 265.1005575416.

The spelling of 18630818 in words is "eighteen million, six hundred thirty thousand, eight hundred eighteen".