19981930 has 16 divisors (see below), whose sum is σ = 36027360. Its totient is φ = 7979472.

The previous prime is 19981891. The next prime is 19981933. The reversal of 19981930 is 3918991.

It is not an unprimeable number, because it can be changed into a prime (19981933) 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, 6601 + ... + 9139.

It is an arithmetic number, because the mean of its divisors is an integer number (2251710).

Almost surely, 2^19981930 is an apocalyptic number.

19981930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19981930 is a deficient number, since it is larger than the sum of its proper divisors (16045430).

19981930 is a wasteful number, since it uses less digits than its factorization.

19981930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 19981930 is about 4470.1152110432. The cubic root of 19981930 is about 271.3599878164.

The spelling of 19981930 in words is "nineteen million, nine hundred eighty-one thousand, nine hundred thirty".