42157507 has 4 divisors (see below), whose sum is σ = 48180016. Its totient is φ = 36135000.

The previous prime is 42157499. The next prime is 42157519. The reversal of 42157507 is 70575124.

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 42157507 - 2³ = 42157499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42157537) 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, 3011244 + ... + 3011257.

It is an arithmetic number, because the mean of its divisors is an integer number (12045004).

Almost surely, 2^42157507 is an apocalyptic number.

42157507 is a deficient number, since it is larger than the sum of its proper divisors (6022509).

42157507 is an equidigital number, since it uses as much as digits as its factorization.

42157507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6022508.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 42157507 is about 6492.8812556522. The cubic root of 42157507 is about 348.0366450819.

The spelling of 42157507 in words is "forty-two million, one hundred fifty-seven thousand, five hundred seven".