16868641 has 6 divisors (see below), whose sum is σ = 17919590. Its totient is φ = 15876096.

The previous prime is 16868639. The next prime is 16868653. The reversal of 16868641 is 14686861.

It can be written as a sum of positive squares in 3 ways, for example, as 7134241 + 9734400 = 2671^2 + 3120^2 .

It is not a de Polignac number, because 16868641 - 2¹ = 16868639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16868594 and 16868603.

It is not an unprimeable number, because it can be changed into a prime (16868611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28896 + ... + 29473.

Almost surely, 2^16868641 is an apocalyptic number.

It is an amenable number.

16868641 is a deficient number, since it is larger than the sum of its proper divisors (1050949).

16868641 is an equidigital number, since it uses as much as digits as its factorization.

16868641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58403 (or 58386 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 16868641 is about 4107.1451155273. The cubic root of 16868641 is about 256.4641694736.

The spelling of 16868641 in words is "sixteen million, eight hundred sixty-eight thousand, six hundred forty-one".