1142887 has 4 divisors (see below), whose sum is σ = 1159056. Its totient is φ = 1126720.

The previous prime is 1142881. The next prime is 1142891. The reversal of 1142887 is 7882411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7882411 = 2693 ⋅2927.

It is a cyclic number.

It is not a de Polignac number, because 1142887 - 2⁷ = 1142759 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142881) 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, 7978 + ... + 8119.

It is an arithmetic number, because the mean of its divisors is an integer number (289764).

2^1142887 is an apocalyptic number.

1142887 is a deficient number, since it is larger than the sum of its proper divisors (16169).

1142887 is an equidigital number, since it uses as much as digits as its factorization.

1142887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16168.

The product of its digits is 3584, while the sum is 31.

The square root of 1142887 is about 1069.0589319584. The cubic root of 1142887 is about 104.5525021771.

The spelling of 1142887 in words is "one million, one hundred forty-two thousand, eight hundred eighty-seven".