18994530 has 16 divisors (see below), whose sum is σ = 45586944. Its totient is φ = 5065200.

The previous prime is 18994529. The next prime is 18994541. The reversal of 18994530 is 3549981.

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, 316546 + ... + 316605.

It is an arithmetic number, because the mean of its divisors is an integer number (2849184).

Almost surely, 2^18994530 is an apocalyptic number.

18994530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18994530 is an abundant number, since it is smaller than the sum of its proper divisors (26592414).

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

18994530 is a wasteful number, since it uses less digits than its factorization.

18994530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633161.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 18994530 is about 4358.2714463420. The cubic root of 18994530 is about 266.8145551214.

The spelling of 18994530 in words is "eighteen million, nine hundred ninety-four thousand, five hundred thirty".