18538438426 has 32 divisors (see below), whose sum is σ = 30738901248. Its totient is φ = 8340499200.

The previous prime is 18538438381. The next prime is 18538438427. The reversal of 18538438426 is 62483483581.

It is not an unprimeable number, because it can be changed into a prime (18538438427) 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 15 ways as a sum of consecutive naturals, for example, 1990236 + ... + 1999528.

It is an arithmetic number, because the mean of its divisors is an integer number (960590664).

Almost surely, 2^18538438426 is an apocalyptic number.

18538438426 is a deficient number, since it is larger than the sum of its proper divisors (12200462822).

18538438426 is a wasteful number, since it uses less digits than its factorization.

18538438426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11886.

The product of its digits is 4423680, while the sum is 52.

The spelling of 18538438426 in words is "eighteen billion, five hundred thirty-eight million, four hundred thirty-eight thousand, four hundred twenty-six".