18434439688 has 32 divisors (see below), whose sum is σ = 39514527360. Its totient is φ = 7898042880.

The previous prime is 18434439677. The next prime is 18434439707. The reversal of 18434439688 is 88693443481.

It is a happy number.

It is a super-2 number, since 2×18434439688² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139245 + ... + 237187.

It is an arithmetic number, because the mean of its divisors is an integer number (1234828980).

Almost surely, 2^18434439688 is an apocalyptic number.

It is an amenable number.

18434439688 is an abundant number, since it is smaller than the sum of its proper divisors (21080087672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18434439688 is a wasteful number, since it uses less digits than its factorization.

18434439688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101317 (or 101313 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 58.

The spelling of 18434439688 in words is "eighteen billion, four hundred thirty-four million, four hundred thirty-nine thousand, six hundred eighty-eight".