1142857 has 4 divisors (see below), whose sum is σ = 1148800. Its totient is φ = 1136916.

The previous prime is 1142851. The next prime is 1142863. The reversal of 1142857 is 7582411.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7582411 = 131 ⋅57881.

It is an interprime number because it is at equal distance from previous prime (1142851) and next prime (1142863).

It is a cyclic number.

It is not a de Polignac number, because 1142857 - 2¹⁵ = 1110089 is a prime.

It is a super-2 number, since 2×1142857² = 2612244244898, which contains 22 as substring.

It is a Duffinian number.

1142857 is a modest number, since divided by 142857 gives 1 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1142851) 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, 2673 + ... + 3070.

It is an arithmetic number, because the mean of its divisors is an integer number (287200).

2^1142857 is an apocalyptic number.

It is an amenable number.

1142857 is a deficient number, since it is larger than the sum of its proper divisors (5943).

1142857 is an equidigital number, since it uses as much as digits as its factorization.

1142857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5942.

The product of its digits is 2240, while the sum is 28.

The square root of 1142857 is about 1069.0449008344. The cubic root of 1142857 is about 104.5515873586.

The spelling of 1142857 in words is "one million, one hundred forty-two thousand, eight hundred fifty-seven".