18858946 has 4 divisors (see below), whose sum is σ = 28288422. Its totient is φ = 9429472.

The previous prime is 18858929. The next prime is 18858947. The reversal of 18858946 is 64985881.

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

It can be written as a sum of positive squares in only one way, i.e., 12880921 + 5978025 = 3589^2 + 2445^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18858946.

It is not an unprimeable number, because it can be changed into a prime (18858947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4714735 + ... + 4714738.

Almost surely, 2^18858946 is an apocalyptic number.

18858946 is a deficient number, since it is larger than the sum of its proper divisors (9429476).

18858946 is an equidigital number, since it uses as much as digits as its factorization.

18858946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9429475.

The product of its digits is 552960, while the sum is 49.

The square root of 18858946 is about 4342.6887984289. The cubic root of 18858946 is about 266.1781929244.

The spelling of 18858946 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred forty-six".