19982109 has 16 divisors (see below), whose sum is σ = 31273088. Its totient is φ = 11109312.

The previous prime is 19982107. The next prime is 19982111. The reversal of 19982109 is 90128991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19982107) and next prime (19982111).

It is not a de Polignac number, because 19982109 - 2¹ = 19982107 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19982107) 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 15 ways as a sum of consecutive naturals, for example, 12082 + ... + 13635.

It is an arithmetic number, because the mean of its divisors is an integer number (1954568).

Almost surely, 2^19982109 is an apocalyptic number.

It is an amenable number.

19982109 is a deficient number, since it is larger than the sum of its proper divisors (11290979).

19982109 is a wasteful number, since it uses less digits than its factorization.

19982109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25764.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 19982109 is about 4470.1352328537. The cubic root of 19982109 is about 271.3607981034.

The spelling of 19982109 in words is "nineteen million, nine hundred eighty-two thousand, one hundred nine".