8742157 has 2 divisors, whose sum is σ = 8742158. Its totient is φ = 8742156.

The previous prime is 8742133. The next prime is 8742161. The reversal of 8742157 is 7512478.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6651241 + 2090916 = 2579^2 + 1446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8742157 is a prime.

It is equal to p₅₈₆₃₇₅ and since 8742157 and 586375 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8742187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4371078 + 4371079.

It is an arithmetic number, because the mean of its divisors is an integer number (4371079).

Almost surely, 2^8742157 is an apocalyptic number.

It is an amenable number.

8742157 is a deficient number, since it is larger than the sum of its proper divisors (1).

8742157 is an equidigital number, since it uses as much as digits as its factorization.

8742157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 34.

The square root of 8742157 is about 2956.7138853802. The cubic root of 8742157 is about 206.0026785085.

It can be divided in two parts, 87421 and 57, that added together give a palindrome (87478).

The spelling of 8742157 in words is "eight million, seven hundred forty-two thousand, one hundred fifty-seven".