18984390967 has 4 divisors (see below), whose sum is σ = 19172355336. Its totient is φ = 18796426600.

The previous prime is 18984390941. The next prime is 18984390983. The reversal of 18984390967 is 76909348981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18984390967 - 2¹¹ = 18984388919 is a prime.

It is a super-2 number, since 2×18984390967² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18984390899 and 18984390908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18984390367) 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 3 ways as a sum of consecutive naturals, for example, 93982033 + ... + 93982234.

It is an arithmetic number, because the mean of its divisors is an integer number (4793088834).

Almost surely, 2^18984390967 is an apocalyptic number.

18984390967 is a deficient number, since it is larger than the sum of its proper divisors (187964369).

18984390967 is a wasteful number, since it uses less digits than its factorization.

18984390967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187964368.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 18984390967 in words is "eighteen billion, nine hundred eighty-four million, three hundred ninety thousand, nine hundred sixty-seven".