188981793 has 72 divisors (see below), whose sum is σ = 369480384. Its totient is φ = 90573120.

The previous prime is 188981791. The next prime is 188981801. The reversal of 188981793 is 397189881.

It is not a de Polignac number, because 188981793 - 2¹ = 188981791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (188981791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 98146 + ... + 100052.

It is an arithmetic number, because the mean of its divisors is an integer number (5131672).

Almost surely, 2^188981793 is an apocalyptic number.

188981793 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

188981793 is a deficient number, since it is larger than the sum of its proper divisors (180498591).

188981793 is a wasteful number, since it uses less digits than its factorization.

188981793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955 (or 1941 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 188981793 is about 13747.0648867313. The cubic root of 188981793 is about 573.8609263362.

The spelling of 188981793 in words is "one hundred eighty-eight million, nine hundred eighty-one thousand, seven hundred ninety-three".