19981801 has 8 divisors (see below), whose sum is σ = 23393664. Its totient is φ = 16709280.

The previous prime is 19981777. The next prime is 19981807. The reversal of 19981801 is 10818991.

It is a happy number.

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

It is not a de Polignac number, because 19981801 - 2⁵ = 19981769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19981807) 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, 34525 + ... + 35098.

It is an arithmetic number, because the mean of its divisors is an integer number (2924208).

Almost surely, 2^19981801 is an apocalyptic number.

It is an amenable number.

19981801 is a deficient number, since it is larger than the sum of its proper divisors (3411863).

19981801 is an equidigital number, since it uses as much as digits as its factorization.

19981801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69671.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 19981801 is about 4470.1007818616. The cubic root of 19981801 is about 271.3594038636.

The spelling of 19981801 in words is "nineteen million, nine hundred eighty-one thousand, eight hundred one".