188009930 has 16 divisors (see below), whose sum is σ = 343966824. Its totient is φ = 73970880.

The previous prime is 188009923. The next prime is 188009933. The reversal of 188009930 is 39900881.

It can be written as a sum of positive squares in 4 ways, for example, as 124121881 + 63888049 = 11141^2 + 7993^2 .

It is not an unprimeable number, because it can be changed into a prime (188009933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153497 + ... + 154716.

Almost surely, 2^188009930 is an apocalyptic number.

188009930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188009930 is a deficient number, since it is larger than the sum of its proper divisors (155956894).

188009930 is a wasteful number, since it uses less digits than its factorization.

188009930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308281.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 188009930 is about 13711.6713058620. The cubic root of 188009930 is about 572.8755175089.

The spelling of 188009930 in words is "one hundred eighty-eight million, nine thousand, nine hundred thirty".