1921017944 has 16 divisors (see below), whose sum is σ = 3603027120. Its totient is φ = 960210720.

The previous prime is 1921017907. The next prime is 1921017949. The reversal of 1921017944 is 4497101291.

It is a junction number, because it is equal to n+sod(n) for n = 1921017898 and 1921017907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921017949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8612 + ... + 62579.

It is an arithmetic number, because the mean of its divisors is an integer number (225189195).

Almost surely, 2^1921017944 is an apocalyptic number.

It is an amenable number.

1921017944 is a deficient number, since it is larger than the sum of its proper divisors (1682009176).

1921017944 is a wasteful number, since it uses less digits than its factorization.

1921017944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74570 (or 74566 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1921017944 is about 43829.4187047923. The cubic root of 1921017944 is about 1243.1126155668.

The spelling of 1921017944 in words is "one billion, nine hundred twenty-one million, seventeen thousand, nine hundred forty-four".