188081845 has 12 divisors (see below), whose sum is σ = 262547244. Its totient is φ = 128970240.

The previous prime is 188081843. The next prime is 188081891. The reversal of 188081845 is 548180881.

It can be written as a sum of positive squares in 2 ways, for example, as 42107121 + 145974724 = 6489^2 + 12082^2 .

It is not a de Polignac number, because 188081845 - 2¹ = 188081843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188081843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 383596 + ... + 384085.

It is an arithmetic number, because the mean of its divisors is an integer number (21878937).

Almost surely, 2^188081845 is an apocalyptic number.

It is an amenable number.

188081845 is a deficient number, since it is larger than the sum of its proper divisors (74465399).

188081845 is an equidigital number, since it uses as much as digits as its factorization.

188081845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767700 (or 767693 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 43.

The square root of 188081845 is about 13714.2934560990. The cubic root of 188081845 is about 572.9485510468.

The spelling of 188081845 in words is "one hundred eighty-eight million, eighty-one thousand, eight hundred forty-five".