742857 has 8 divisors (see below), whose sum is σ = 996384. Its totient is φ = 492288.

The previous prime is 742817. The next prime is 742891. The reversal of 742857 is 758247.

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

It is not a de Polignac number, because 742857 - 2¹⁰ = 741833 is a prime.

It is an Ulam number.

742857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (742817) 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 7 ways as a sum of consecutive naturals, for example, 63 + ... + 1220.

It is an arithmetic number, because the mean of its divisors is an integer number (124548).

2⁷⁴²⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

742857 is a deficient number, since it is larger than the sum of its proper divisors (253527).

742857 is a wasteful number, since it uses less digits than its factorization.

742857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479.

The product of its digits is 15680, while the sum is 33.

The square root of 742857 is about 861.8915244971. The cubic root of 742857 is about 90.5666714636.

The spelling of 742857 in words is "seven hundred forty-two thousand, eight hundred fifty-seven".