42810857 has 4 divisors (see below), whose sum is σ = 45064080. Its totient is φ = 40557636.

The previous prime is 42810839. The next prime is 42810881. The reversal of 42810857 is 75801824.

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 42810857 - 2¹⁴ = 42794473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42810457) 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, 1126583 + ... + 1126620.

It is an arithmetic number, because the mean of its divisors is an integer number (11266020).

Almost surely, 2^42810857 is an apocalyptic number.

It is an amenable number.

42810857 is a deficient number, since it is larger than the sum of its proper divisors (2253223).

42810857 is a wasteful number, since it uses less digits than its factorization.

42810857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253222.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 42810857 is about 6543.0006113403. Note that the first 3 decimals coincide. The cubic root of 42810857 is about 349.8253741127.

The spelling of 42810857 in words is "forty-two million, eight hundred ten thousand, eight hundred fifty-seven".