142442539 has 4 divisors (see below), whose sum is σ = 142476624. Its totient is φ = 142408456.

The previous prime is 142442533. The next prime is 142442549. The reversal of 142442539 is 935244241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935244241 = 277 ⋅3376333.

It is a cyclic number.

It is not a de Polignac number, because 142442539 - 2¹⁹ = 141918251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142442533) 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, 9727 + ... + 19480.

It is an arithmetic number, because the mean of its divisors is an integer number (35619156).

Almost surely, 2^142442539 is an apocalyptic number.

142442539 is a deficient number, since it is larger than the sum of its proper divisors (34085).

142442539 is an equidigital number, since it uses as much as digits as its factorization.

142442539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34084.

The product of its digits is 34560, while the sum is 34.

The square root of 142442539 is about 11934.9293671978. The cubic root of 142442539 is about 522.2517477916.

The spelling of 142442539 in words is "one hundred forty-two million, four hundred forty-two thousand, five hundred thirty-nine".