42347857 has 4 divisors (see below), whose sum is σ = 42426676. Its totient is φ = 42269040.

The previous prime is 42347849. The next prime is 42347873. The reversal of 42347857 is 75874324.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6395841 + 35952016 = 2529^2 + 5996^2 .

It is a cyclic number.

It is not a de Polignac number, because 42347857 - 2³ = 42347849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42347897) 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, 38598 + ... + 39679.

It is an arithmetic number, because the mean of its divisors is an integer number (10606669).

Almost surely, 2^42347857 is an apocalyptic number.

It is an amenable number.

42347857 is a deficient number, since it is larger than the sum of its proper divisors (78819).

42347857 is an equidigital number, since it uses as much as digits as its factorization.

42347857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78818.

The product of its digits is 188160, while the sum is 40.

The square root of 42347857 is about 6507.5231079113. The cubic root of 42347857 is about 348.5596781897.

The spelling of 42347857 in words is "forty-two million, three hundred forty-seven thousand, eight hundred fifty-seven".