19818930 has 32 divisors (see below), whose sum is σ = 47755008. Its totient is φ = 5264000.

The previous prime is 19818907. The next prime is 19818941. The reversal of 19818930 is 3981891.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7255 + ... + 9605.

It is an arithmetic number, because the mean of its divisors is an integer number (1492344).

Almost surely, 2^19818930 is an apocalyptic number.

19818930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19818930 is an abundant number, since it is smaller than the sum of its proper divisors (27936078).

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

19818930 is a wasteful number, since it uses less digits than its factorization.

19818930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 19818930 is about 4451.8456846571. The cubic root of 19818930 is about 270.6201110471.

The spelling of 19818930 in words is "nineteen million, eight hundred eighteen thousand, nine hundred thirty".