18630418 has 8 divisors (see below), whose sum is σ = 28002060. Its totient is φ = 9296400.

The previous prime is 18630397. The next prime is 18630449. The reversal of 18630418 is 81403681.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 508369 = 4257^2 + 713^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18630418.

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, 8133 + ... + 10168.

Almost surely, 2^18630418 is an apocalyptic number.

18630418 is a deficient number, since it is larger than the sum of its proper divisors (9371642).

18630418 is a wasteful number, since it uses less digits than its factorization.

18630418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18812.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18630418 is about 4316.2967923904. The cubic root of 18630418 is about 265.0986603091.

It can be divided in two parts, 18 and 630418, that added together give a square (630436 = 794²).

The spelling of 18630418 in words is "eighteen million, six hundred thirty thousand, four hundred eighteen".