18994505 has 8 divisors (see below), whose sum is σ = 23409672. Its totient is φ = 14784768.

The previous prime is 18994499. The next prime is 18994529. The reversal of 18994505 is 50549981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8111104 + 10883401 = 2848^2 + 3299^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18994505 - 2¹⁸ = 18732361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 51152 + ... + 51521.

It is an arithmetic number, because the mean of its divisors is an integer number (2926209).

Almost surely, 2^18994505 is an apocalyptic number.

It is an amenable number.

18994505 is a deficient number, since it is larger than the sum of its proper divisors (4415167).

18994505 is a wasteful number, since it uses less digits than its factorization.

18994505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102715.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 18994505 is about 4358.2685782315. The cubic root of 18994505 is about 266.8144380637.

The spelling of 18994505 in words is "eighteen million, nine hundred ninety-four thousand, five hundred five".