188400381488 has 80 divisors (see below), whose sum is σ = 420518442240. Its totient is φ = 80868038400.

The previous prime is 188400381479. The next prime is 188400381509. The reversal of 188400381488 is 884183004881.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949406 + ... + 1130562.

It is an arithmetic number, because the mean of its divisors is an integer number (5256480528).

Almost surely, 2^188400381488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 188400381488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210259221120).

188400381488 is an abundant number, since it is smaller than the sum of its proper divisors (232118060752).

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

188400381488 is a wasteful number, since it uses less digits than its factorization.

188400381488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181506 (or 181500 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 53.

The spelling of 188400381488 in words is "one hundred eighty-eight billion, four hundred million, three hundred eighty-one thousand, four hundred eighty-eight".