7142857 has 4 divisors (see below), whose sum is σ = 7453440. Its totient is φ = 6832276.

The previous prime is 7142851. The next prime is 7142869. The reversal of 7142857 is 7582417.

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 7142857 - 2¹⁹ = 6618569 is a prime.

It is a super-2 number, since 2×7142857² = 102040812244898, which contains 22 as substring.

It is a Duffinian number.

7142857 is a modest number, since divided by 142857 gives 7 as remainder.

It is not an unprimeable number, because it can be changed into a prime (7142851) 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, 155257 + ... + 155302.

It is an arithmetic number, because the mean of its divisors is an integer number (1863360).

Almost surely, 2^7142857 is an apocalyptic number.

It is an amenable number.

7142857 is a deficient number, since it is larger than the sum of its proper divisors (310583).

7142857 is a wasteful number, since it uses less digits than its factorization.

7142857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310582.

The product of its digits is 15680, while the sum is 34.

The square root of 7142857 is about 2672.6123923981. The cubic root of 7142857 is about 192.5856772715.

It can be divided in two parts, 7 and 142857, that multiplied together give a palindrome (999999).

The spelling of 7142857 in words is "seven million, one hundred forty-two thousand, eight hundred fifty-seven".