1921763556 has 84 divisors (see below), whose sum is σ = 5054801472. Its totient is φ = 639004464.

The previous prime is 1921763533. The next prime is 1921763629. The reversal of 1921763556 is 6553671291.

1921763556 is a `hidden beast` number, since 1 + 9 + 2 + 1 + 7 + 635 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2166145 + ... + 2167031.

It is an arithmetic number, because the mean of its divisors is an integer number (60176208).

Almost surely, 2^1921763556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921763556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2527400736).

1921763556 is an abundant number, since it is smaller than the sum of its proper divisors (3133037916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1921763556 is an equidigital number, since it uses as much as digits as its factorization.

1921763556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1635 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 1921763556 is about 43837.9237190814. The cubic root of 1921763556 is about 1243.2734261055.

The spelling of 1921763556 in words is "one billion, nine hundred twenty-one million, seven hundred sixty-three thousand, five hundred fifty-six".