19981934 has 8 divisors (see below), whose sum is σ = 34254768. Its totient is φ = 8563680.

The previous prime is 19981933. The next prime is 19981937. The reversal of 19981934 is 43918991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19981933) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 713627 + ... + 713654.

It is an arithmetic number, because the mean of its divisors is an integer number (4281846).

Almost surely, 2^19981934 is an apocalyptic number.

19981934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19981934 is a deficient number, since it is larger than the sum of its proper divisors (14272834).

19981934 is a wasteful number, since it uses less digits than its factorization.

19981934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427290.

The product of its digits is 69984, while the sum is 44.

The square root of 19981934 is about 4470.1156584590. The cubic root of 19981934 is about 271.3600059235.

The spelling of 19981934 in words is "nineteen million, nine hundred eighty-one thousand, nine hundred thirty-four".