8721743 has 4 divisors (see below), whose sum is σ = 8907360. Its totient is φ = 8536128.

The previous prime is 8721737. The next prime is 8721749. The reversal of 8721743 is 3471278.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8721737) and next prime (8721749).

It is a cyclic number.

It is not a de Polignac number, because 8721743 - 2⁸ = 8721487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721749) 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 3 ways as a sum of consecutive naturals, for example, 92738 + ... + 92831.

It is an arithmetic number, because the mean of its divisors is an integer number (2226840).

Almost surely, 2^8721743 is an apocalyptic number.

8721743 is a deficient number, since it is larger than the sum of its proper divisors (185617).

8721743 is a wasteful number, since it uses less digits than its factorization.

8721743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185616.

The product of its digits is 9408, while the sum is 32.

The square root of 8721743 is about 2953.2597244401. The cubic root of 8721743 is about 205.8422064322.

It can be divided in two parts, 872 and 1743, that multiplied together give a triangular number (1519896 = T₁₇₄₃).

The spelling of 8721743 in words is "eight million, seven hundred twenty-one thousand, seven hundred forty-three".