142242817 has 4 divisors (see below), whose sum is σ = 145712196. Its totient is φ = 138773440.

The previous prime is 142242811. The next prime is 142242823. The reversal of 142242817 is 718242241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 718242241 = 229 ⋅3136429.

It is an interprime number because it is at equal distance from previous prime (142242811) and next prime (142242823).

It can be written as a sum of positive squares in 2 ways, for example, as 77986561 + 64256256 = 8831^2 + 8016^2 .

It is a cyclic number.

It is not a de Polignac number, because 142242817 - 2²⁷ = 8025089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142242811) 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 3 ways as a sum of consecutive naturals, for example, 1734628 + ... + 1734709.

It is an arithmetic number, because the mean of its divisors is an integer number (36428049).

Almost surely, 2^142242817 is an apocalyptic number.

It is an amenable number.

142242817 is a deficient number, since it is larger than the sum of its proper divisors (3469379).

142242817 is an equidigital number, since it uses as much as digits as its factorization.

142242817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469378.

The product of its digits is 7168, while the sum is 31.

The square root of 142242817 is about 11926.5593110503. The cubic root of 142242817 is about 522.0075465114.

The spelling of 142242817 in words is "one hundred forty-two million, two hundred forty-two thousand, eight hundred seventeen".