16872661 has 8 divisors (see below), whose sum is σ = 18469304. Its totient is φ = 15318720.

The previous prime is 16872659. The next prime is 16872679. The reversal of 16872661 is 16627861.

It can be written as a sum of positive squares in 4 ways, for example, as 2387025 + 14485636 = 1545^2 + 3806^2 .

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 16872661 - 2¹ = 16872659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16872661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16872601) 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 7 ways as a sum of consecutive naturals, for example, 9846 + ... + 11431.

It is an arithmetic number, because the mean of its divisors is an integer number (2308663).

Almost surely, 2^16872661 is an apocalyptic number.

It is an amenable number.

16872661 is a deficient number, since it is larger than the sum of its proper divisors (1596643).

16872661 is a wasteful number, since it uses less digits than its factorization.

16872661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21351.

The product of its digits is 24192, while the sum is 37.

The square root of 16872661 is about 4107.6344774091. The cubic root of 16872661 is about 256.4845406873.

The spelling of 16872661 in words is "sixteen million, eight hundred seventy-two thousand, six hundred sixty-one".