8721043 has 2 divisors, whose sum is σ = 8721044. Its totient is φ = 8721042.

The previous prime is 8721029. The next prime is 8721049. The reversal of 8721043 is 3401278.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8721043 - 2⁹ = 8720531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8720999 and 8721017.

It is not a weakly prime, because it can be changed into another prime (8721049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360521 + 4360522.

It is an arithmetic number, because the mean of its divisors is an integer number (4360522).

Almost surely, 2^8721043 is an apocalyptic number.

8721043 is a deficient number, since it is larger than the sum of its proper divisors (1).

8721043 is an equidigital number, since it uses as much as digits as its factorization.

8721043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 8721043 is about 2953.1412089502. The cubic root of 8721043 is about 205.8366993755.

It can be divided in two parts, 87 and 21043, that multiplied together give a triangular number (1830741 = T₁₉₁₃).

The spelling of 8721043 in words is "eight million, seven hundred twenty-one thousand, forty-three".