1921764772 has 24 divisors (see below), whose sum is σ = 3552319232. Its totient is φ = 908258400.

The previous prime is 1921764763. The next prime is 1921764773. The reversal of 1921764772 is 2774671291.

It is not an unprimeable number, because it can be changed into a prime (1921764773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174879 + ... + 185542.

Almost surely, 2^1921764772 is an apocalyptic number.

It is an amenable number.

1921764772 is a deficient number, since it is larger than the sum of its proper divisors (1630554460).

1921764772 is a wasteful number, since it uses less digits than its factorization.

1921764772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360499 (or 360497 counting only the distinct ones).

The product of its digits is 296352, while the sum is 46.

The square root of 1921764772 is about 43837.9375883492. The cubic root of 1921764772 is about 1243.2736883334.

The spelling of 1921764772 in words is "one billion, nine hundred twenty-one million, seven hundred sixty-four thousand, seven hundred seventy-two".