188344021 has 4 divisors (see below), whose sum is σ = 188482572. Its totient is φ = 188205472.

The previous prime is 188344019. The next prime is 188344061. The reversal of 188344021 is 120443881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160402225 + 27941796 = 12665^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 188344021 - 2¹ = 188344019 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 (188344001) 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 3 ways as a sum of consecutive naturals, for example, 67216 + ... + 69961.

It is an arithmetic number, because the mean of its divisors is an integer number (47120643).

Almost surely, 2^188344021 is an apocalyptic number.

It is an amenable number.

188344021 is a deficient number, since it is larger than the sum of its proper divisors (138551).

188344021 is a wasteful number, since it uses less digits than its factorization.

188344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138550.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 188344021 is about 13723.8486220156. The cubic root of 188344021 is about 573.2146472896.

The spelling of 188344021 in words is "one hundred eighty-eight million, three hundred forty-four thousand, twenty-one".