188639401 has 8 divisors (see below), whose sum is σ = 193420584. Its totient is φ = 183866880.

The previous prime is 188639393. The next prime is 188639441. The reversal of 188639401 is 104936881.

It can be written as a sum of positive squares in 4 ways, for example, as 32764176 + 155875225 = 5724^2 + 12485^2 .

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 188639401 - 2³ = 188639393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188639441) 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, 86541 + ... + 88693.

It is an arithmetic number, because the mean of its divisors is an integer number (24177573).

Almost surely, 2^188639401 is an apocalyptic number.

It is an amenable number.

188639401 is a deficient number, since it is larger than the sum of its proper divisors (4781183).

188639401 is a wasteful number, since it uses less digits than its factorization.

188639401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 188639401 is about 13734.6059644971. The cubic root of 188639401 is about 573.5141483583.

The spelling of 188639401 in words is "one hundred eighty-eight million, six hundred thirty-nine thousand, four hundred one".