19218930 has 16 divisors (see below), whose sum is σ = 46125504. Its totient is φ = 5125040.

The previous prime is 19218923. The next prime is 19218931. The reversal of 19218930 is 3981291.

It is a junction number, because it is equal to n+sod(n) for n = 19218891 and 19218900.

It is not an unprimeable number, because it can be changed into a prime (19218931) 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, 320286 + ... + 320345.

It is an arithmetic number, because the mean of its divisors is an integer number (2882844).

Almost surely, 2^19218930 is an apocalyptic number.

19218930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19218930 is an abundant number, since it is smaller than the sum of its proper divisors (26906574).

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

19218930 is a wasteful number, since it uses less digits than its factorization.

19218930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640641.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 19218930 is about 4383.9400087136. The cubic root of 19218930 is about 267.8611536669.

The spelling of 19218930 in words is "nineteen million, two hundred eighteen thousand, nine hundred thirty".