16681038 has 48 divisors (see below), whose sum is σ = 37749888. Its totient is φ = 4873200.

The previous prime is 16681037. The next prime is 16681039. The reversal of 16681038 is 83018661.

It is an interprime number because it is at equal distance from previous prime (16681037) and next prime (16681039).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681037) 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 in 23 ways as a sum of consecutive naturals, for example, 63295 + ... + 63557.

It is an arithmetic number, because the mean of its divisors is an integer number (786456).

Almost surely, 2^16681038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16681038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18874944).

16681038 is an abundant number, since it is smaller than the sum of its proper divisors (21068850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16681038 is a wasteful number, since it uses less digits than its factorization.

16681038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 16681038 is about 4084.2426470522. The cubic root of 16681038 is about 255.5098756272.

Adding to 16681038 its reverse (83018661), we get a palindrome (99699699).

The spelling of 16681038 in words is "sixteen million, six hundred eighty-one thousand, thirty-eight".