18444807403 has 16 divisors (see below), whose sum is σ = 21418646400. Its totient is φ = 15706975680.

The previous prime is 18444807401. The next prime is 18444807419. The reversal of 18444807403 is 30470844481.

It is not a de Polignac number, because 18444807403 - 2¹ = 18444807401 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 18444807403.

It is not an unprimeable number, because it can be changed into a prime (18444807401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477201 + ... + 514402.

It is an arithmetic number, because the mean of its divisors is an integer number (1338665400).

Almost surely, 2^18444807403 is an apocalyptic number.

18444807403 is a deficient number, since it is larger than the sum of its proper divisors (2973838997).

18444807403 is a wasteful number, since it uses less digits than its factorization.

18444807403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991722.

The product of its (nonzero) digits is 344064, while the sum is 43.

The spelling of 18444807403 in words is "eighteen billion, four hundred forty-four million, eight hundred seven thousand, four hundred three".