188443720146 has 128 divisors (see below), whose sum is σ = 442226304000. Its totient is φ = 52930056960.

The previous prime is 188443720103. The next prime is 188443720147. The reversal of 188443720146 is 641027344881.

It is a super-2 number, since 2×188443720146² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 188443720095 and 188443720104.

It is not an unprimeable number, because it can be changed into a prime (188443720147) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12511156 + ... + 12526208.

It is an arithmetic number, because the mean of its divisors is an integer number (3454893000).

Almost surely, 2^188443720146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 188443720146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221113152000).

188443720146 is an abundant number, since it is smaller than the sum of its proper divisors (253782583854).

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

188443720146 is a wasteful number, since it uses less digits than its factorization.

188443720146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15304.

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 188443720146 in words is "one hundred eighty-eight billion, four hundred forty-three million, seven hundred twenty thousand, one hundred forty-six".