18387423388 has 6 divisors (see below), whose sum is σ = 32177990936. Its totient is φ = 9193711692.

The previous prime is 18387423367. The next prime is 18387423389. The reversal of 18387423388 is 88332478381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18387423389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2298427920 + ... + 2298427927.

Almost surely, 2^18387423388 is an apocalyptic number.

It is an amenable number.

18387423388 is a deficient number, since it is larger than the sum of its proper divisors (13790567548).

18387423388 is a wasteful number, since it uses less digits than its factorization.

18387423388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596855851 (or 4596855849 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 55.

The spelling of 18387423388 in words is "eighteen billion, three hundred eighty-seven million, four hundred twenty-three thousand, three hundred eighty-eight".