1921939556 has 12 divisors (see below), whose sum is σ = 3561241068. Its totient is φ = 904442112.

The previous prime is 1921939531. The next prime is 1921939559. The reversal of 1921939556 is 6559391291.

It can be written as a sum of positive squares in 2 ways, for example, as 1730560000 + 191379556 = 41600^2 + 13834^2 .

It is not an unprimeable number, because it can be changed into a prime (1921939559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14131841 + ... + 14131976.

It is an arithmetic number, because the mean of its divisors is an integer number (296770089).

Almost surely, 2^1921939556 is an apocalyptic number.

It is an amenable number.

1921939556 is a deficient number, since it is larger than the sum of its proper divisors (1639301512).

1921939556 is a wasteful number, since it uses less digits than its factorization.

1921939556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28263838 (or 28263836 counting only the distinct ones).

The product of its digits is 656100, while the sum is 50.

The square root of 1921939556 is about 43839.9310674641. The cubic root of 1921939556 is about 1243.3113789957.

The spelling of 1921939556 in words is "one billion, nine hundred twenty-one million, nine hundred thirty-nine thousand, five hundred fifty-six".