18939540867 has 8 divisors (see below), whose sum is σ = 27195238224. Its totient is φ = 11655102048.

The previous prime is 18939540857. The next prime is 18939540869. The reversal of 18939540867 is 76804593981.

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

It is a de Polignac number, because none of the positive numbers 2^k-18939540867 is a prime.

It is a super-2 number, since 2×18939540867² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18939540867.

It is not an unprimeable number, because it can be changed into a prime (18939540869) 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, 242814588 + ... + 242814665.

It is an arithmetic number, because the mean of its divisors is an integer number (3399404778).

Almost surely, 2^18939540867 is an apocalyptic number.

18939540867 is a deficient number, since it is larger than the sum of its proper divisors (8255697357).

18939540867 is a wasteful number, since it uses less digits than its factorization.

18939540867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485629269.

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 18939540867 in words is "eighteen billion, nine hundred thirty-nine million, five hundred forty thousand, eight hundred sixty-seven".