188640342 has 72 divisors (see below), whose sum is σ = 466364808. Its totient is φ = 54648000.

The previous prime is 188640317. The next prime is 188640343. The reversal of 188640342 is 243046881.

188640342 is a `hidden beast` number, since 1 + 8 + 8 + 640 + 3 + 4 + 2 = 666.

188640342 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 188640297 and 188640306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188640343) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 103842 + ... + 105642.

It is an arithmetic number, because the mean of its divisors is an integer number (6477289).

Almost surely, 2^188640342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 188640342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233182404).

188640342 is an abundant number, since it is smaller than the sum of its proper divisors (277724466).

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

188640342 is a wasteful number, since it uses less digits than its factorization.

188640342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866 (or 1840 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 188640342 is about 13734.6402209887. The cubic root of 188640342 is about 573.5151019871.

The spelling of 188640342 in words is "one hundred eighty-eight million, six hundred forty thousand, three hundred forty-two".