8447157 has 6 divisors (see below), whose sum is σ = 12201462. Its totient is φ = 5631432.

The previous prime is 8447129. The next prime is 8447161. The reversal of 8447157 is 7517448.

It can be written as a sum of positive squares in only one way, i.e., 5803281 + 2643876 = 2409^2 + 1626^2 .

It is not a de Polignac number, because 8447157 - 2⁶ = 8447093 is a prime.

It is a super-2 number, since 2×8447157² = 142708922765298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8447177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 469278 + ... + 469295.

It is an arithmetic number, because the mean of its divisors is an integer number (2033577).

Almost surely, 2^8447157 is an apocalyptic number.

It is an amenable number.

8447157 is a deficient number, since it is larger than the sum of its proper divisors (3754305).

8447157 is a wasteful number, since it uses less digits than its factorization.

8447157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938579 (or 938576 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 8447157 is about 2906.3993187448. The cubic root of 8447157 is about 203.6589601681.

It can be divided in two parts, 844 and 7157, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 8447157 in words is "eight million, four hundred forty-seven thousand, one hundred fifty-seven".