1142139 has 4 divisors (see below), whose sum is σ = 1522856. Its totient is φ = 761424.

The previous prime is 1142131. The next prime is 1142159. The reversal of 1142139 is 9312411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9312411 = 3 ⋅3104137.

It is not a de Polignac number, because 1142139 - 2³ = 1142131 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1142131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190354 + ... + 190359.

It is an arithmetic number, because the mean of its divisors is an integer number (380714).

2^1142139 is an apocalyptic number.

1142139 is a deficient number, since it is larger than the sum of its proper divisors (380717).

1142139 is an equidigital number, since it uses as much as digits as its factorization.

1142139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380716.

The product of its digits is 216, while the sum is 21.

The square root of 1142139 is about 1068.7090343026. The cubic root of 1142139 is about 104.5296879242.

The spelling of 1142139 in words is "one million, one hundred forty-two thousand, one hundred thirty-nine".