18898636 has 6 divisors (see below), whose sum is σ = 33072620. Its totient is φ = 9449316.

The previous prime is 18898631. The next prime is 18898639. The reversal of 18898636 is 63689881.

It is a self number, because there is not a number n which added to its sum of digits gives 18898636.

It is not an unprimeable number, because it can be changed into a prime (18898631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2362326 + ... + 2362333.

Almost surely, 2^18898636 is an apocalyptic number.

It is an amenable number.

18898636 is a deficient number, since it is larger than the sum of its proper divisors (14173984).

18898636 is a wasteful number, since it uses less digits than its factorization.

18898636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724663 (or 4724661 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 18898636 is about 4347.2561461225. The cubic root of 18898636 is about 266.3647924265.

The spelling of 18898636 in words is "eighteen million, eight hundred ninety-eight thousand, six hundred thirty-six".