188422100 has 18 divisors (see below), whose sum is σ = 408876174. Its totient is φ = 75368800.

The previous prime is 188422099. The next prime is 188422109. The reversal of 188422100 is 1224881.

It can be written as a sum of positive squares in 3 ways, for example, as 2972176 + 185449924 = 1724^2 + 13618^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 188422100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188422109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 942011 + ... + 942210.

It is an arithmetic number, because the mean of its divisors is an integer number (22715343).

Almost surely, 2^188422100 is an apocalyptic number.

188422100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188422100 is an abundant number, since it is smaller than the sum of its proper divisors (220454074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

188422100 is a wasteful number, since it uses less digits than its factorization.

188422100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884235 (or 1884228 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 188422100 is about 13726.6929739104. The cubic root of 188422100 is about 573.2938460576.

Adding to 188422100 its reverse (1224881), we get a palindrome (189646981).

The spelling of 188422100 in words is "one hundred eighty-eight million, four hundred twenty-two thousand, one hundred".