42856057 has 4 divisors (see below), whose sum is σ = 43767936. Its totient is φ = 41944180.

The previous prime is 42856019. The next prime is 42856067. The reversal of 42856057 is 75065824.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42856057 - 2¹⁹ = 42331769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42856067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455869 + ... + 455962.

It is an arithmetic number, because the mean of its divisors is an integer number (10941984).

Almost surely, 2^42856057 is an apocalyptic number.

42856057 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

42856057 is a deficient number, since it is larger than the sum of its proper divisors (911879).

42856057 is an equidigital number, since it uses as much as digits as its factorization.

42856057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911878.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 42856057 is about 6546.4537728453. The cubic root of 42856057 is about 349.9484468286.

The spelling of 42856057 in words is "forty-two million, eight hundred fifty-six thousand, fifty-seven".