18739930 has 16 divisors (see below), whose sum is σ = 36798624. Its totient is φ = 6814480.

The previous prime is 18739907. The next prime is 18739937. The reversal of 18739930 is 3993781.

It is not an unprimeable number, because it can be changed into a prime (18739937) 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, 85072 + ... + 85291.

It is an arithmetic number, because the mean of its divisors is an integer number (2299914).

Almost surely, 2^18739930 is an apocalyptic number.

18739930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18739930 is a deficient number, since it is larger than the sum of its proper divisors (18058694).

18739930 is a wasteful number, since it uses less digits than its factorization.

18739930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170381.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 18739930 is about 4328.9640793151. The cubic root of 18739930 is about 265.6170739042.

The spelling of 18739930 in words is "eighteen million, seven hundred thirty-nine thousand, nine hundred thirty".