19998982 has 8 divisors (see below), whose sum is σ = 31577400. Its totient is φ = 9473184.

The previous prime is 19998977. The next prime is 19998989. The reversal of 19998982 is 28989991.

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 (19998989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263107 + ... + 263182.

It is an arithmetic number, because the mean of its divisors is an integer number (3947175).

Almost surely, 2^19998982 is an apocalyptic number.

19998982 is a deficient number, since it is larger than the sum of its proper divisors (11578418).

19998982 is a wasteful number, since it uses less digits than its factorization.

19998982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526310.

The product of its digits is 839808, while the sum is 55.

The square root of 19998982 is about 4472.0221376912. The cubic root of 19998982 is about 271.4371561195.

The spelling of 19998982 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred eighty-two".