19980001 has 8 divisors (see below), whose sum is σ = 21377600. Its totient is φ = 18617040.

The previous prime is 19979987. The next prime is 19980019. The reversal of 19980001 is 10008991.

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

It is a cyclic number.

It is not a de Polignac number, because 19980001 - 2¹¹ = 19977953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19980041) 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 7 ways as a sum of consecutive naturals, for example, 7461 + ... + 9778.

It is an arithmetic number, because the mean of its divisors is an integer number (2672200).

Almost surely, 2^19980001 is an apocalyptic number.

It is an amenable number.

19980001 is a deficient number, since it is larger than the sum of its proper divisors (1397599).

19980001 is a wasteful number, since it uses less digits than its factorization.

19980001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17319.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 19980001 is about 4469.8994395847. The cubic root of 19980001 is about 271.3512554224.

Adding to 19980001 its reverse (10008991), we get a palindrome (29988992).

It can be divided in two parts, 199 and 80001, that added together give a triangular number (80200 = T₄₀₀).

The spelling of 19980001 in words is "nineteen million, nine hundred eighty thousand, one".