18943030 has 16 divisors (see below), whose sum is σ = 35580384. Its totient is φ = 7247680.

The previous prime is 18942997. The next prime is 18943037. The reversal of 18943030 is 3034981.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18943030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40951 + ... + 41410.

It is an arithmetic number, because the mean of its divisors is an integer number (2223774).

Almost surely, 2^18943030 is an apocalyptic number.

18943030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18943030 is a deficient number, since it is larger than the sum of its proper divisors (16637354).

18943030 is a wasteful number, since it uses less digits than its factorization.

18943030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82391.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 18943030 is about 4352.3591304027. The cubic root of 18943030 is about 266.5731981452.

The spelling of 18943030 in words is "eighteen million, nine hundred forty-three thousand, thirty".