1287983 has 2 divisors, whose sum is σ = 1287984. Its totient is φ = 1287982.

The previous prime is 1287973. The next prime is 1287989. The reversal of 1287983 is 3897821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1287983 - 2⁴ = 1287967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643991 + 643992.

It is an arithmetic number, because the mean of its divisors is an integer number (643992).

2^1287983 is an apocalyptic number.

1287983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287983 is an equidigital number, since it uses as much as digits as its factorization.

1287983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 1287983 is about 1134.8933870633. The cubic root of 1287983 is about 108.8019578205.

The spelling of 1287983 in words is "one million, two hundred eighty-seven thousand, nine hundred eighty-three".