8721801 has 18 divisors (see below), whose sum is σ = 13849290. Its totient is φ = 5285280.

The previous prime is 8721773. The next prime is 8721851. The reversal of 8721801 is 1081278.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 853776 = 2805^2 + 924^2 .

It is not a de Polignac number, because 8721801 - 2⁶ = 8721737 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8721851) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2916 + ... + 5093.

It is an arithmetic number, because the mean of its divisors is an integer number (769405).

Almost surely, 2^8721801 is an apocalyptic number.

It is an amenable number.

8721801 is a deficient number, since it is larger than the sum of its proper divisors (5127489).

8721801 is a wasteful number, since it uses less digits than its factorization.

8721801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8037 (or 8023 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 8721801 is about 2953.2695440816. The cubic root of 8721801 is about 205.8426627179.

The spelling of 8721801 in words is "eight million, seven hundred twenty-one thousand, eight hundred one".