42018157 has 2 divisors, whose sum is σ = 42018158. Its totient is φ = 42018156.

The previous prime is 42018131. The next prime is 42018161. The reversal of 42018157 is 75181024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29387241 + 12630916 = 5421^2 + 3554^2 .

It is a cyclic number.

It is not a de Polignac number, because 42018157 - 2¹¹ = 42016109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42018127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21009078 + 21009079.

It is an arithmetic number, because the mean of its divisors is an integer number (21009079).

Almost surely, 2^42018157 is an apocalyptic number.

It is an amenable number.

42018157 is a deficient number, since it is larger than the sum of its proper divisors (1).

42018157 is an equidigital number, since it uses as much as digits as its factorization.

42018157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 42018157 is about 6482.1413900038. The cubic root of 42018157 is about 347.6527479196.

The spelling of 42018157 in words is "forty-two million, eighteen thousand, one hundred fifty-seven".