188330381 has 4 divisors (see below), whose sum is σ = 188366112. Its totient is φ = 188294652.

The previous prime is 188330377. The next prime is 188330383. The reversal of 188330381 is 183033881.

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.

It is a cyclic number.

It is not a de Polignac number, because 188330381 - 2² = 188330377 is a prime.

It is a super-2 number, since 2×188330381² = 70936664815210322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188330383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8225 + ... + 21078.

It is an arithmetic number, because the mean of its divisors is an integer number (47091528).

Almost surely, 2^188330381 is an apocalyptic number.

It is an amenable number.

188330381 is a deficient number, since it is larger than the sum of its proper divisors (35731).

188330381 is an equidigital number, since it uses as much as digits as its factorization.

188330381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35730.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 188330381 is about 13723.3516678689. The cubic root of 188330381 is about 573.2008094261.

The spelling of 188330381 in words is "one hundred eighty-eight million, three hundred thirty thousand, three hundred eighty-one".