16864729 has 12 divisors (see below), whose sum is σ = 19747776. Its totient is φ = 14108472.

The previous prime is 16864709. The next prime is 16864733. The reversal of 16864729 is 92746861.

It is a de Polignac number, because none of the positive numbers 2^k-16864729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16864709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12292 + ... + 13594.

It is an arithmetic number, because the mean of its divisors is an integer number (1645648).

Almost surely, 2^16864729 is an apocalyptic number.

It is an amenable number.

16864729 is a deficient number, since it is larger than the sum of its proper divisors (2883047).

16864729 is an equidigital number, since it uses as much as digits as its factorization.

16864729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396 (or 1353 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 16864729 is about 4106.6688446964. The cubic root of 16864729 is about 256.4443424387. Note that the first 3 decimals are identical.

The spelling of 16864729 in words is "sixteen million, eight hundred sixty-four thousand, seven hundred twenty-nine".