18994515 has 8 divisors (see below), whose sum is σ = 30391248. Its totient is φ = 10130400.

The previous prime is 18994499. The next prime is 18994529. The reversal of 18994515 is 51549981.

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

It is not a de Polignac number, because 18994515 - 2⁴ = 18994499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633136 + ... + 633165.

It is an arithmetic number, because the mean of its divisors is an integer number (3798906).

Almost surely, 2^18994515 is an apocalyptic number.

18994515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18994515 is a deficient number, since it is larger than the sum of its proper divisors (11396733).

18994515 is a wasteful number, since it uses less digits than its factorization.

18994515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266309.

The product of its digits is 64800, while the sum is 42.

The square root of 18994515 is about 4358.2697254759. The cubic root of 18994515 is about 266.8144848868.

The spelling of 18994515 in words is "eighteen million, nine hundred ninety-four thousand, five hundred fifteen".