188640434 has 8 divisors (see below), whose sum is σ = 295263360. Its totient is φ = 90219316.

The previous prime is 188640401. The next prime is 188640451. The reversal of 188640434 is 434046881.

188640434 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 2050394 + ... + 2050485.

It is an arithmetic number, because the mean of its divisors is an integer number (36907920).

Almost surely, 2^188640434 is an apocalyptic number.

188640434 is a deficient number, since it is larger than the sum of its proper divisors (106622926).

188640434 is a wasteful number, since it uses less digits than its factorization.

188640434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100904.

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 188640434 is about 13734.6435701841. The cubic root of 188640434 is about 573.5151952216.

The spelling of 188640434 in words is "one hundred eighty-eight million, six hundred forty thousand, four hundred thirty-four".