1975643136 has 110 divisors (see below), whose sum is σ = 5899904340. Its totient is φ = 658520064.

The previous prime is 1975643129. The next prime is 1975643141. The reversal of 1975643136 is 6313465791.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1975643091 and 1975643100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 71035 + ... + 94853.

It is an arithmetic number, because the mean of its divisors is an integer number (53635494).

Almost surely, 2^1975643136 is an apocalyptic number.

1975643136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1975643136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2949952170).

1975643136 is an abundant number, since it is smaller than the sum of its proper divisors (3924261204).

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

1975643136 is an equidigital number, since it uses as much as digits as its factorization.

1975643136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23851 (or 23824 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 1975643136 is about 44448.2073429289. The cubic root of 1975643136 is about 1254.7855246363.

The spelling of 1975643136 in words is "one billion, nine hundred seventy-five million, six hundred forty-three thousand, one hundred thirty-six".