188999993 has 32 divisors (see below), whose sum is σ = 246253056. Its totient is φ = 140963328.

The previous prime is 188999977. The next prime is 189000017. The reversal of 188999993 is 399999881.

It is a cyclic number.

It is not a de Polignac number, because 188999993 - 2⁴ = 188999977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (188999933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152171 + ... + 153407.

It is an arithmetic number, because the mean of its divisors is an integer number (7695408).

Almost surely, 2^188999993 is an apocalyptic number.

188999993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

188999993 is a deficient number, since it is larger than the sum of its proper divisors (57253063).

188999993 is a wasteful number, since it uses less digits than its factorization.

188999993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its digits is 11337408, while the sum is 65.

The square root of 188999993 is about 13747.7268302800. The cubic root of 188999993 is about 573.8793477468.

The spelling of 188999993 in words is "one hundred eighty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-three".