18339373988 has 24 divisors (see below), whose sum is σ = 34590864000. Its totient is φ = 8457420960.

The previous prime is 18339373981. The next prime is 18339374017. The reversal of 18339373988 is 88937393381.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18339373988.

It is not an unprimeable number, because it can be changed into a prime (18339373981) 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, 79238 + ... + 207261.

It is an arithmetic number, because the mean of its divisors is an integer number (1441286000).

Almost surely, 2^18339373988 is an apocalyptic number.

It is an amenable number.

18339373988 is a deficient number, since it is larger than the sum of its proper divisors (16251490012).

18339373988 is a wasteful number, since it uses less digits than its factorization.

18339373988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287747 (or 287745 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 62.

The spelling of 18339373988 in words is "eighteen billion, three hundred thirty-nine million, three hundred seventy-three thousand, nine hundred eighty-eight".