188448905 has 4 divisors (see below), whose sum is σ = 226138692. Its totient is φ = 150759120.

The previous prime is 188448899. The next prime is 188448937. The reversal of 188448905 is 509844881.

It is a happy number.

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 90992521 + 97456384 = 9539^2 + 9872^2 .

It is not a de Polignac number, because 188448905 - 2⁴ = 188448889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 188448905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18844886 + ... + 18844895.

It is an arithmetic number, because the mean of its divisors is an integer number (56534673).

Almost surely, 2^188448905 is an apocalyptic number.

It is an amenable number.

188448905 is a deficient number, since it is larger than the sum of its proper divisors (37689787).

188448905 is an equidigital number, since it uses as much as digits as its factorization.

188448905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37689786.

The product of its (nonzero) digits is 368640, while the sum is 47.

The square root of 188448905 is about 13727.6693214835. The cubic root of 188448905 is about 573.3210304358.

The spelling of 188448905 in words is "one hundred eighty-eight million, four hundred forty-eight thousand, nine hundred five".