18966730 has 64 divisors (see below), whose sum is σ = 38568960. Its totient is φ = 6681600.

The previous prime is 18966719. The next prime is 18966733. The reversal of 18966730 is 3766981.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18966733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310900 + ... + 310960.

It is an arithmetic number, because the mean of its divisors is an integer number (602640).

Almost surely, 2^18966730 is an apocalyptic number.

18966730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18966730 is an abundant number, since it is smaller than the sum of its proper divisors (19602230).

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

18966730 is a wasteful number, since it uses less digits than its factorization.

18966730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 18966730 is about 4355.0809406944. The cubic root of 18966730 is about 266.6843234836.

The spelling of 18966730 in words is "eighteen million, nine hundred sixty-six thousand, seven hundred thirty".