1931321828 has 12 divisors (see below), whose sum is σ = 3394970880. Its totient is φ = 961330152.

The previous prime is 1931321813. The next prime is 1931321831. The reversal of 1931321828 is 8281231391.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1931321791 and 1931321800.

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, 1081688 + ... + 1083471.

It is an arithmetic number, because the mean of its divisors is an integer number (282914240).

Almost surely, 2^1931321828 is an apocalyptic number.

It is an amenable number.

1931321828 is a deficient number, since it is larger than the sum of its proper divisors (1463649052).

1931321828 is a wasteful number, since it uses less digits than its factorization.

1931321828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165386 (or 2165384 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 1931321828 is about 43946.8068009497. The cubic root of 1931321828 is about 1245.3312404979.

The spelling of 1931321828 in words is "one billion, nine hundred thirty-one million, three hundred twenty-one thousand, eight hundred twenty-eight".