1138641844 has 12 divisors (see below), whose sum is σ = 2109836484. Its totient is φ = 535831424.

The previous prime is 1138641821. The next prime is 1138641851. The reversal of 1138641844 is 4481468311.

It can be written as a sum of positive squares in 2 ways, for example, as 534072100 + 604569744 = 23110^2 + 24588^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1138641797 and 1138641806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8372299 + ... + 8372434.

It is an arithmetic number, because the mean of its divisors is an integer number (175819707).

Almost surely, 2^1138641844 is an apocalyptic number.

It is an amenable number.

1138641844 is a deficient number, since it is larger than the sum of its proper divisors (971194640).

1138641844 is a wasteful number, since it uses less digits than its factorization.

1138641844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16744754 (or 16744752 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 1138641844 is about 33743.7674837888. The cubic root of 1138641844 is about 1044.2289112603.

The spelling of 1138641844 in words is "one billion, one hundred thirty-eight million, six hundred forty-one thousand, eight hundred forty-four".