42840057 has 8 divisors (see below), whose sum is σ = 61513984. Its totient is φ = 26363088.

The previous prime is 42839999. The next prime is 42840067. The reversal of 42840057 is 75004824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42840057 - 2¹⁰ = 42839033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42840067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549193 + ... + 549270.

It is an arithmetic number, because the mean of its divisors is an integer number (7689248).

Almost surely, 2^42840057 is an apocalyptic number.

It is an amenable number.

42840057 is a deficient number, since it is larger than the sum of its proper divisors (18673927).

42840057 is a wasteful number, since it uses less digits than its factorization.

42840057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098479.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 42840057 is about 6545.2316230978. The cubic root of 42840057 is about 349.9048911643.

The spelling of 42840057 in words is "forty-two million, eight hundred forty thousand, fifty-seven".