16868538 has 24 divisors (see below), whose sum is σ = 36766548. Its totient is φ = 5589312.

The previous prime is 16868531. The next prime is 16868543. The reversal of 16868538 is 83586861.

It can be written as a sum of positive squares in 2 ways, for example, as 16867449 + 1089 = 4107^2 + 33^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16868493 and 16868502.

It is not an unprimeable number, because it can be changed into a prime (16868531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406 + ... + 5822.

Almost surely, 2^16868538 is an apocalyptic number.

16868538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16868538 is an abundant number, since it is smaller than the sum of its proper divisors (19898010).

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

16868538 is a wasteful number, since it uses less digits than its factorization.

16868538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5598 (or 5595 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 16868538 is about 4107.1325763846. The cubic root of 16868538 is about 256.4636474820.

It can be divided in two parts, 1686853 and 8, that added together give a palindrome (1686861).

The spelling of 16868538 in words is "sixteen million, eight hundred sixty-eight thousand, five hundred thirty-eight".