188442013 has 4 divisors (see below), whose sum is σ = 196635168. Its totient is φ = 180248860.

The previous prime is 188441983. The next prime is 188442017. The reversal of 188442013 is 310244881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310244881 = 53 ⋅5853677.

It is a cyclic number.

It is not a de Polignac number, because 188442013 - 2⁹ = 188441501 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188442017) 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, 4096543 + ... + 4096588.

It is an arithmetic number, because the mean of its divisors is an integer number (49158792).

Almost surely, 2^188442013 is an apocalyptic number.

It is an amenable number.

188442013 is a deficient number, since it is larger than the sum of its proper divisors (8193155).

188442013 is an equidigital number, since it uses as much as digits as its factorization.

188442013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8193154.

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

The square root of 188442013 is about 13727.4182933281. The cubic root of 188442013 is about 573.3140411377.

Adding to 188442013 its reverse (310244881), we get a palindrome (498686894).

The spelling of 188442013 in words is "one hundred eighty-eight million, four hundred forty-two thousand, thirteen".