188428207 has 8 divisors (see below), whose sum is σ = 208928592. Its totient is φ = 168489600.

The previous prime is 188428181. The next prime is 188428243. The reversal of 188428207 is 702824881.

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 188428207 - 2¹¹ = 188426159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 188428207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188428267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139738 + ... + 141079.

It is an arithmetic number, because the mean of its divisors is an integer number (26116074).

Almost surely, 2^188428207 is an apocalyptic number.

188428207 is a deficient number, since it is larger than the sum of its proper divisors (20500385).

188428207 is a wasteful number, since it uses less digits than its factorization.

188428207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280889.

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 188428207 is about 13726.9154219001. The cubic root of 188428207 is about 573.3000397183.

The spelling of 188428207 in words is "one hundred eighty-eight million, four hundred twenty-eight thousand, two hundred seven".