19998901 has 8 divisors (see below), whose sum is σ = 21611744. Its totient is φ = 18396720.

The previous prime is 19998899. The next prime is 19998917. The reversal of 19998901 is 10989991.

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 19998901 - 2¹ = 19998899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1486 + ... + 6496.

It is an arithmetic number, because the mean of its divisors is an integer number (2701468).

Almost surely, 2^19998901 is an apocalyptic number.

It is an amenable number.

19998901 is a deficient number, since it is larger than the sum of its proper divisors (1612843).

19998901 is a wasteful number, since it uses less digits than its factorization.

19998901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 19998901 is about 4472.0130813762. The cubic root of 19998901 is about 271.4367896602.

The spelling of 19998901 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred one".