8972729 has 4 divisors (see below), whose sum is σ = 8980980. Its totient is φ = 8964480.

The previous prime is 8972701. The next prime is 8972749. The reversal of 8972729 is 9272798.

8972729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7155625 + 1817104 = 2675^2 + 1348^2 .

It is a cyclic number.

It is not a de Polignac number, because 8972729 - 2⁸ = 8972473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8972729.

It is not an unprimeable number, because it can be changed into a prime (8972749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2192 + ... + 4769.

It is an arithmetic number, because the mean of its divisors is an integer number (2245245).

Almost surely, 2^8972729 is an apocalyptic number.

It is an amenable number.

8972729 is a deficient number, since it is larger than the sum of its proper divisors (8251).

8972729 is a wasteful number, since it uses less digits than its factorization.

8972729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8250.

The product of its digits is 127008, while the sum is 44.

The square root of 8972729 is about 2995.4513850170. The cubic root of 8972729 is about 207.7980735722.

The spelling of 8972729 in words is "eight million, nine hundred seventy-two thousand, seven hundred twenty-nine".