18949730 has 48 divisors (see below), whose sum is σ = 37134720. Its totient is φ = 6958848.

The previous prime is 18949729. The next prime is 18949739. The reversal of 18949730 is 3794981.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228269 + ... + 228351.

It is an arithmetic number, because the mean of its divisors is an integer number (773640).

Almost surely, 2^18949730 is an apocalyptic number.

18949730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18949730 is a deficient number, since it is larger than the sum of its proper divisors (18184990).

18949730 is a wasteful number, since it uses less digits than its factorization.

18949730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18949730 is about 4353.1287598692. The cubic root of 18949730 is about 266.6046227185.

The spelling of 18949730 in words is "eighteen million, nine hundred forty-nine thousand, seven hundred thirty".