188139217388 has 12 divisors (see below), whose sum is σ = 329256035472. Its totient is φ = 94066064400.

The previous prime is 188139217313. The next prime is 188139217393. The reversal of 188139217388 is 883712931881.

It is a super-3 number, since 3×188139217388³ (a number of 35 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764795 + ... + 980402.

It is an arithmetic number, because the mean of its divisors is an integer number (27438002956).

Almost surely, 2^188139217388 is an apocalyptic number.

It is an amenable number.

188139217388 is a deficient number, since it is larger than the sum of its proper divisors (141116818084).

188139217388 is a wasteful number, since it uses less digits than its factorization.

188139217388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772152 (or 1772150 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 59.

The spelling of 188139217388 in words is "one hundred eighty-eight billion, one hundred thirty-nine million, two hundred seventeen thousand, three hundred eighty-eight".