1381831928 has 16 divisors (see below), whose sum is σ = 2591353080. Its totient is φ = 690804448.

The previous prime is 1381831903. The next prime is 1381831931. The reversal of 1381831928 is 8291381831.

It is a Cunningham number, because it is equal to 37173²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65051 + ... + 83637.

Almost surely, 2^1381831928 is an apocalyptic number.

It is an amenable number.

1381831928 is a deficient number, since it is larger than the sum of its proper divisors (1209521152).

1381831928 is a wasteful number, since it uses less digits than its factorization.

1381831928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27886 (or 27882 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 1381831928 is about 37172.9999865494. Note that the first 4 decimals coincide. The cubic root of 1381831928 is about 1113.8287090769.

The spelling of 1381831928 in words is "one billion, three hundred eighty-one million, eight hundred thirty-one thousand, nine hundred twenty-eight".