18979930 has 16 divisors (see below), whose sum is σ = 34224840. Its totient is φ = 7578432.

The previous prime is 18979901. The next prime is 18979931. The reversal of 18979930 is 3997981.

It can be written as a sum of positive squares in 4 ways, for example, as 5650129 + 13329801 = 2377^2 + 3651^2 .

It is not an unprimeable number, because it can be changed into a prime (18979931) by changing a digit.

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, 5752 + ... + 8428.

Almost surely, 2^18979930 is an apocalyptic number.

18979930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18979930 is a deficient number, since it is larger than the sum of its proper divisors (15244910).

18979930 is a wasteful number, since it uses less digits than its factorization.

18979930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 18979930 is about 4356.5961483709. The cubic root of 18979930 is about 266.7461759440.

The spelling of 18979930 in words is "eighteen million, nine hundred seventy-nine thousand, nine hundred thirty".