8722145 has 4 divisors (see below), whose sum is σ = 10466580. Its totient is φ = 6977712.

The previous prime is 8722123. The next prime is 8722169. The reversal of 8722145 is 5412278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5412278 = 2 ⋅2706139.

It can be written as a sum of positive squares in 2 ways, for example, as 3265249 + 5456896 = 1807^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 8722145 - 2⁶ = 8722081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872210 + ... + 872219.

It is an arithmetic number, because the mean of its divisors is an integer number (2616645).

Almost surely, 2^8722145 is an apocalyptic number.

It is an amenable number.

8722145 is a deficient number, since it is larger than the sum of its proper divisors (1744435).

8722145 is a wasteful number, since it uses less digits than its factorization.

8722145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744434.

The product of its digits is 4480, while the sum is 29.

The square root of 8722145 is about 2953.3277840429. The cubic root of 8722145 is about 205.8453689229.

The spelling of 8722145 in words is "eight million, seven hundred twenty-two thousand, one hundred forty-five".