8724321 has 8 divisors (see below), whose sum is σ = 12924960. Its totient is φ = 5816196.

The previous prime is 8724319. The next prime is 8724323. The reversal of 8724321 is 1234278.

It is an interprime number because it is at equal distance from previous prime (8724319) and next prime (8724323).

It is not a de Polignac number, because 8724321 - 2¹ = 8724319 is a prime.

It is a super-2 number, since 2×8724321² = 152227553822082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 323123 = 8724321 / (8 + 7 + 2 + 4 + 3 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8724323) 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, 161535 + ... + 161588.

It is an arithmetic number, because the mean of its divisors is an integer number (1615620).

Almost surely, 2^8724321 is an apocalyptic number.

It is an amenable number.

8724321 is a deficient number, since it is larger than the sum of its proper divisors (4200639).

8724321 is a wasteful number, since it uses less digits than its factorization.

8724321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323132 (or 323126 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 8724321 is about 2953.6961590522. The cubic root of 8724321 is about 205.8624855947.

Adding to 8724321 its reverse (1234278), we get a palindrome (9958599).

It can be divided in two parts, 8724 and 321, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 8724321 in words is "eight million, seven hundred twenty-four thousand, three hundred twenty-one".