18994519 has 8 divisors (see below), whose sum is σ = 19768320. Its totient is φ = 18235896.

The previous prime is 18994499. The next prime is 18994529. The reversal of 18994519 is 91549981.

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 18994519 - 2⁵ = 18994487 is a prime.

It is a super-2 number, since 2×18994519² = 721583504082722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994529) 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 in 7 ways as a sum of consecutive naturals, for example, 1207 + ... + 6280.

It is an arithmetic number, because the mean of its divisors is an integer number (2471040).

Almost surely, 2^18994519 is an apocalyptic number.

18994519 is a deficient number, since it is larger than the sum of its proper divisors (773801).

18994519 is an equidigital number, since it uses as much as digits as its factorization.

18994519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7589.

The product of its digits is 116640, while the sum is 46.

The square root of 18994519 is about 4358.2701843736. The cubic root of 18994519 is about 266.8145036160.

The spelling of 18994519 in words is "eighteen million, nine hundred ninety-four thousand, five hundred nineteen".