188420689 has 8 divisors (see below), whose sum is σ = 192618720. Its totient is φ = 184256256.

The previous prime is 188420633. The next prime is 188420693. The reversal of 188420689 is 986024881.

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

It is a cyclic number.

It is not a de Polignac number, because 188420689 - 2¹¹ = 188418641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188420699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3114 + ... + 19660.

It is an arithmetic number, because the mean of its divisors is an integer number (24077340).

Almost surely, 2^188420689 is an apocalyptic number.

It is an amenable number.

188420689 is a deficient number, since it is larger than the sum of its proper divisors (4198031).

188420689 is a wasteful number, since it uses less digits than its factorization.

188420689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16799.

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 188420689 is about 13726.6415776038. The cubic root of 188420689 is about 573.2924150159.

The spelling of 188420689 in words is "one hundred eighty-eight million, four hundred twenty thousand, six hundred eighty-nine".