142589987 has 4 divisors (see below), whose sum is σ = 147189696. Its totient is φ = 137990280.

The previous prime is 142589983. The next prime is 142589989. The reversal of 142589987 is 789985241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789985241 = 769 ⋅1027289.

It is a cyclic number.

It is not a de Polignac number, because 142589987 - 2² = 142589983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142589983) 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, 2299808 + ... + 2299869.

It is an arithmetic number, because the mean of its divisors is an integer number (36797424).

Almost surely, 2^142589987 is an apocalyptic number.

142589987 is a deficient number, since it is larger than the sum of its proper divisors (4599709).

142589987 is an equidigital number, since it uses as much as digits as its factorization.

142589987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4599708.

The product of its digits is 1451520, while the sum is 53.

The square root of 142589987 is about 11941.1049321242. The cubic root of 142589987 is about 522.4318869111.

The spelling of 142589987 in words is "one hundred forty-two million, five hundred eighty-nine thousand, nine hundred eighty-seven".