18913894247 has 8 divisors (see below), whose sum is σ = 19474025376. Its totient is φ = 18356339232.

The previous prime is 18913894229. The next prime is 18913894253. The reversal of 18913894247 is 74249831981.

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 18913894247 - 2¹⁰ = 18913893223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18913894192 and 18913894201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913894547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629123 + ... + 658500.

It is an arithmetic number, because the mean of its divisors is an integer number (2434253172).

Almost surely, 2^18913894247 is an apocalyptic number.

18913894247 is a deficient number, since it is larger than the sum of its proper divisors (560131129).

18913894247 is a wasteful number, since it uses less digits than its factorization.

18913894247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288057.

The product of its digits is 3483648, while the sum is 56.

The spelling of 18913894247 in words is "eighteen billion, nine hundred thirteen million, eight hundred ninety-four thousand, two hundred forty-seven".