8722157 has 4 divisors (see below), whose sum is σ = 8886780. Its totient is φ = 8557536.

The previous prime is 8722123. The next prime is 8722169. The reversal of 8722157 is 7512278.

8722157 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 an emirpimes, since its reverse is a distinct semiprime: 7512278 = 2 ⋅3756139.

It can be written as a sum of positive squares in 2 ways, for example, as 4605316 + 4116841 = 2146^2 + 2029^2 .

It is a cyclic number.

It is not a de Polignac number, because 8722157 - 2⁶ = 8722093 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 (8722117) 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, 82232 + ... + 82337.

It is an arithmetic number, because the mean of its divisors is an integer number (2221695).

Almost surely, 2^8722157 is an apocalyptic number.

It is an amenable number.

8722157 is a deficient number, since it is larger than the sum of its proper divisors (164623).

8722157 is a wasteful number, since it uses less digits than its factorization.

8722157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164622.

The product of its digits is 7840, while the sum is 32.

The square root of 8722157 is about 2953.3298156488. The cubic root of 8722157 is about 205.8454633242.

It can be divided in two parts, 87221 and 57, that added together give a palindrome (87278).

The spelling of 8722157 in words is "eight million, seven hundred twenty-two thousand, one hundred fifty-seven".