188868406 has 4 divisors (see below), whose sum is σ = 283302612. Its totient is φ = 94434202.

The previous prime is 188868401. The next prime is 188868443. The reversal of 188868406 is 604868881.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 188868406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188868401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47217100 + ... + 47217103.

It is an arithmetic number, because the mean of its divisors is an integer number (70825653).

Almost surely, 2^188868406 is an apocalyptic number.

188868406 is a deficient number, since it is larger than the sum of its proper divisors (94434206).

188868406 is an equidigital number, since it uses as much as digits as its factorization.

188868406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94434205.

The product of its (nonzero) digits is 589824, while the sum is 49.

The square root of 188868406 is about 13742.9402239841. The cubic root of 188868406 is about 573.7461332908.

The spelling of 188868406 in words is "one hundred eighty-eight million, eight hundred sixty-eight thousand, four hundred six".