18432371938 has 4 divisors (see below), whose sum is σ = 27648557910. Its totient is φ = 9216185968.

The previous prime is 18432371921. The next prime is 18432371939. The reversal of 18432371938 is 83917323481.

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

It can be written as a sum of positive squares in only one way, i.e., 16362758889 + 2069613049 = 127917^2 + 45493^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18432371891 and 18432371900.

It is not an unprimeable number, because it can be changed into a prime (18432371939) 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 as a sum of consecutive naturals, namely, 4608092983 + ... + 4608092986.

Almost surely, 2^18432371938 is an apocalyptic number.

18432371938 is a deficient number, since it is larger than the sum of its proper divisors (9216185972).

18432371938 is an equidigital number, since it uses as much as digits as its factorization.

18432371938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9216185971.

The product of its digits is 870912, while the sum is 49.

The spelling of 18432371938 in words is "eighteen billion, four hundred thirty-two million, three hundred seventy-one thousand, nine hundred thirty-eight".