10866721 has 6 divisors (see below), whose sum is σ = 10960530. Its totient is φ = 10773648.

The previous prime is 10866683. The next prime is 10866743. The reversal of 10866721 is 12766801.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 239121 = 3260^2 + 489^2 .

It is not a de Polignac number, because 10866721 - 2⁹ = 10866209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10866761) 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, 26365 + ... + 26773.

It is an arithmetic number, because the mean of its divisors is an integer number (1826755).

Almost surely, 2^10866721 is an apocalyptic number.

It is an amenable number.

10866721 is a deficient number, since it is larger than the sum of its proper divisors (93809).

10866721 is an frugal number, since it uses more digits than its factorization.

10866721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 10866721 is about 3296.4709918335. The cubic root of 10866721 is about 221.4961451362.

The spelling of 10866721 in words is "ten million, eight hundred sixty-six thousand, seven hundred twenty-one".