18919801 has 8 divisors (see below), whose sum is σ = 19955520. Its totient is φ = 17888112.

The previous prime is 18919757. The next prime is 18919807. The reversal of 18919801 is 10891981.

It is a happy number.

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 18919801 - 2⁷ = 18919673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18919807) 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, 18171 + ... + 19183.

It is an arithmetic number, because the mean of its divisors is an integer number (2494440).

Almost surely, 2^18919801 is an apocalyptic number.

It is an amenable number.

18919801 is a deficient number, since it is larger than the sum of its proper divisors (1035719).

18919801 is a wasteful number, since it uses less digits than its factorization.

18919801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015.

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

The square root of 18919801 is about 4349.6897590518. The cubic root of 18919801 is about 266.4641912681.

It can be divided in two parts, 1891980 and 1, that added together give a palindrome (1891981).

The spelling of 18919801 in words is "eighteen million, nine hundred nineteen thousand, eight hundred one".