188899385 has 8 divisors (see below), whose sum is σ = 229226760. Its totient is φ = 149421184.

The previous prime is 188899363. The next prime is 188899397. The reversal of 188899385 is 583998881.

It can be written as a sum of positive squares in 4 ways, for example, as 1849 + 188897536 = 43^2 + 13744^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 188899385 - 2¹⁴ = 188883001 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 211802 + ... + 212691.

It is an arithmetic number, because the mean of its divisors is an integer number (28653345).

Almost surely, 2^188899385 is an apocalyptic number.

It is an amenable number.

188899385 is a deficient number, since it is larger than the sum of its proper divisors (40327375).

188899385 is an equidigital number, since it uses as much as digits as its factorization.

188899385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424587.

The product of its digits is 4976640, while the sum is 59.

The square root of 188899385 is about 13744.0672655513. The cubic root of 188899385 is about 573.7775010036. Note that the first 3 decimals are identical.

The spelling of 188899385 in words is "one hundred eighty-eight million, eight hundred ninety-nine thousand, three hundred eighty-five".