42918157 has 2 divisors, whose sum is σ = 42918158. Its totient is φ = 42918156.

The previous prime is 42918137. The next prime is 42918163. The reversal of 42918157 is 75181924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42653961 + 264196 = 6531^2 + 514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42918157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42918107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21459078 + 21459079.

It is an arithmetic number, because the mean of its divisors is an integer number (21459079).

Almost surely, 2^42918157 is an apocalyptic number.

It is an amenable number.

42918157 is a deficient number, since it is larger than the sum of its proper divisors (1).

42918157 is an equidigital number, since it uses as much as digits as its factorization.

42918157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 42918157 is about 6551.1950818152. The cubic root of 42918157 is about 350.1173946335.

The spelling of 42918157 in words is "forty-two million, nine hundred eighteen thousand, one hundred fifty-seven".