1623968987 has 2 divisors, whose sum is σ = 1623968988. Its totient is φ = 1623968986.

The previous prime is 1623968977. The next prime is 1623969019. The reversal of 1623968987 is 7898693261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1623968987 - 2¹⁰ = 1623967963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623968977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811984493 + 811984494.

It is an arithmetic number, because the mean of its divisors is an integer number (811984494).

Almost surely, 2^1623968987 is an apocalyptic number.

1623968987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623968987 is an equidigital number, since it uses as much as digits as its factorization.

1623968987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 59.

The square root of 1623968987 is about 40298.4985700460. The cubic root of 1623968987 is about 1175.4186495510.

The spelling of 1623968987 in words is "one billion, six hundred twenty-three million, nine hundred sixty-eight thousand, nine hundred eighty-seven".