1963840973 has 2 divisors, whose sum is σ = 1963840974. Its totient is φ = 1963840972.

The previous prime is 1963840939. The next prime is 1963840987. The reversal of 1963840973 is 3790483691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1681164004 + 282676969 = 41002^2 + 16813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1963840973 - 2⁶ = 1963840909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1963840913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981920486 + 981920487.

It is an arithmetic number, because the mean of its divisors is an integer number (981920487).

Almost surely, 2^1963840973 is an apocalyptic number.

It is an amenable number.

1963840973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963840973 is an equidigital number, since it uses as much as digits as its factorization.

1963840973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 1963840973 is about 44315.2453789889. The cubic root of 1963840973 is about 1252.2819060291.

The spelling of 1963840973 in words is "one billion, nine hundred sixty-three million, eight hundred forty thousand, nine hundred seventy-three".