16787987 has 2 divisors, whose sum is σ = 16787988. Its totient is φ = 16787986.

The previous prime is 16787941. The next prime is 16788041. The reversal of 16787987 is 78978761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16787987 - 2⁶ = 16787923 is a prime.

It is not a weakly prime, because it can be changed into another prime (16780987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8393993 + 8393994.

It is an arithmetic number, because the mean of its divisors is an integer number (8393994).

Almost surely, 2^16787987 is an apocalyptic number.

16787987 is a deficient number, since it is larger than the sum of its proper divisors (1).

16787987 is an equidigital number, since it uses as much as digits as its factorization.

16787987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 53.

The square root of 16787987 is about 4097.3146083746. The cubic root of 16787987 is about 256.0547724193.

The spelling of 16787987 in words is "sixteen million, seven hundred eighty-seven thousand, nine hundred eighty-seven".