42157087 has 4 divisors (see below), whose sum is σ = 48179536. Its totient is φ = 36134640.

The previous prime is 42157079. The next prime is 42157099. The reversal of 42157087 is 78075124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42157087 - 2³ = 42157079 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 (42157187) 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 in 3 ways as a sum of consecutive naturals, for example, 3011214 + ... + 3011227.

It is an arithmetic number, because the mean of its divisors is an integer number (12044884).

Almost surely, 2^42157087 is an apocalyptic number.

42157087 is a deficient number, since it is larger than the sum of its proper divisors (6022449).

42157087 is an equidigital number, since it uses as much as digits as its factorization.

42157087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6022448.

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

The square root of 42157087 is about 6492.8489124575. The cubic root of 42157087 is about 348.0354892903.

The spelling of 42157087 in words is "forty-two million, one hundred fifty-seven thousand, eighty-seven".