1928731136 has 20 divisors (see below), whose sum is σ = 3853696242. Its totient is φ = 964365312.

The previous prime is 1928731127. The next prime is 1928731157. The reversal of 1928731136 is 6311378291.

It can be written as a sum of positive squares in only one way, i.e., 1923348736 + 5382400 = 43856^2 + 2320^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1928731093 and 1928731102.

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 as a sum of consecutive naturals, namely, 1883015 + ... + 1884038.

Almost surely, 2^1928731136 is an apocalyptic number.

1928731136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1928731136 is a deficient number, since it is larger than the sum of its proper divisors (1924965106).

1928731136 is an frugal number, since it uses more digits than its factorization.

1928731136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3767071 (or 3767055 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 1928731136 is about 43917.3215941045. The cubic root of 1928731136 is about 1244.7741585911.

The spelling of 1928731136 in words is "one billion, nine hundred twenty-eight million, seven hundred thirty-one thousand, one hundred thirty-six".