8723121 has 16 divisors (see below), whose sum is σ = 13099008. Its totient is φ = 5115600.

The previous prime is 8723107. The next prime is 8723123. The reversal of 8723121 is 1213278.

It is not a de Polignac number, because 8723121 - 2⁵ = 8723089 is a prime.

8723121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8723091 and 8723100.

It is not an unprimeable number, because it can be changed into a prime (8723123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3241 + ... + 5286.

It is an arithmetic number, because the mean of its divisors is an integer number (818688).

Almost surely, 2^8723121 is an apocalyptic number.

It is an amenable number.

8723121 is a deficient number, since it is larger than the sum of its proper divisors (4375887).

8723121 is a wasteful number, since it uses less digits than its factorization.

8723121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8572.

The product of its digits is 672, while the sum is 24.

The square root of 8723121 is about 2953.4930167515. The cubic root of 8723121 is about 205.8530466057.

Adding to 8723121 its reverse (1213278), we get a palindrome (9936399).

It can be divided in two parts, 872 and 3121, that added together give a palindrome (3993).

The spelling of 8723121 in words is "eight million, seven hundred twenty-three thousand, one hundred twenty-one".