18972803449 has 8 divisors (see below), whose sum is σ = 19037340000. Its totient is φ = 18908324256.

The previous prime is 18972803407. The next prime is 18972803483. The reversal of 18972803449 is 94430827981.

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

It is not a de Polignac number, because 18972803449 - 2¹⁵ = 18972770681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18972803449.

It is not an unprimeable number, because it can be changed into a prime (18972813449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709677 + ... + 735925.

It is an arithmetic number, because the mean of its divisors is an integer number (2379667500).

Almost surely, 2^18972803449 is an apocalyptic number.

It is an amenable number.

18972803449 is a deficient number, since it is larger than the sum of its proper divisors (64536551).

18972803449 is a wasteful number, since it uses less digits than its factorization.

18972803449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28679.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 18972803449 in words is "eighteen billion, nine hundred seventy-two million, eight hundred three thousand, four hundred forty-nine".