18994518 has 12 divisors (see below), whose sum is σ = 41154828. Its totient is φ = 6331500.

The previous prime is 18994499. The next prime is 18994529. The reversal of 18994518 is 81549981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 527608 + ... + 527643.

It is an arithmetic number, because the mean of its divisors is an integer number (3429569).

Almost surely, 2^18994518 is an apocalyptic number.

18994518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18994518 is an abundant number, since it is smaller than the sum of its proper divisors (22160310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18994518 is a wasteful number, since it uses less digits than its factorization.

18994518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055259 (or 1055256 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 18994518 is about 4358.2700696492. The cubic root of 18994518 is about 266.8144989337.

The spelling of 18994518 in words is "eighteen million, nine hundred ninety-four thousand, five hundred eighteen".