1973981668 has 24 divisors (see below), whose sum is σ = 3753585920. Its totient is φ = 904880160.

The previous prime is 1973981663. The next prime is 1973981677. The reversal of 1973981668 is 8661893791.

It is not an unprimeable number, because it can be changed into a prime (1973981663) 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, 416571 + ... + 421282.

Almost surely, 2^1973981668 is an apocalyptic number.

It is an amenable number.

1973981668 is a deficient number, since it is larger than the sum of its proper divisors (1779604252).

1973981668 is a wasteful number, since it uses less digits than its factorization.

1973981668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837907 (or 837905 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 58.

The square root of 1973981668 is about 44429.5134792178. The cubic root of 1973981668 is about 1254.4336779137.

The spelling of 1973981668 in words is "one billion, nine hundred seventy-three million, nine hundred eighty-one thousand, six hundred sixty-eight".