16787989 has 8 divisors (see below), whose sum is σ = 17112608. Its totient is φ = 16465680.

The previous prime is 16787987. The next prime is 16788041. The reversal of 16787989 is 98978761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16787989 - 2¹ = 16787987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16787987) 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 in 7 ways as a sum of consecutive naturals, for example, 21799 + ... + 22555.

It is an arithmetic number, because the mean of its divisors is an integer number (2139076).

Almost surely, 2^16787989 is an apocalyptic number.

It is an amenable number.

16787989 is a deficient number, since it is larger than the sum of its proper divisors (324619).

16787989 is an equidigital number, since it uses as much as digits as its factorization.

16787989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its digits is 1524096, while the sum is 55.

The square root of 16787989 is about 4097.3148524369. The cubic root of 16787989 is about 256.0547825875.

The spelling of 16787989 in words is "sixteen million, seven hundred eighty-seven thousand, nine hundred eighty-nine".