188425381 has 8 divisors (see below), whose sum is σ = 193413528. Its totient is φ = 183456000.

The previous prime is 188425351. The next prime is 188425387. The reversal of 188425381 is 183524881.

188425381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 872356 + 187553025 = 934^2 + 13695^2 .

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 188425381 - 2⁹ = 188424869 is a prime.

It is a super-2 number, since 2×188425381² = 71008248409990322, which contains 22 as substring.

It is a house 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 (188425387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16951 + ... + 25771.

It is an arithmetic number, because the mean of its divisors is an integer number (24176691).

Almost surely, 2^188425381 is an apocalyptic number.

It is an amenable number.

188425381 is a deficient number, since it is larger than the sum of its proper divisors (4988147).

188425381 is an equidigital number, since it uses as much as digits as its factorization.

188425381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9383.

The product of its digits is 61440, while the sum is 40.

The square root of 188425381 is about 13726.8124850600. The cubic root of 188425381 is about 573.2971736329.

The spelling of 188425381 in words is "one hundred eighty-eight million, four hundred twenty-five thousand, three hundred eighty-one".