142028509 has 6 divisors (see below), whose sum is σ = 165216894. Its totient is φ = 121738680.

The previous prime is 142028443. The next prime is 142028539. The reversal of 142028509 is 905820241.

It can be written as a sum of positive squares in only one way, i.e., 132756484 + 9272025 = 11522^2 + 3045^2 .

It is not a de Polignac number, because 142028509 - 2¹⁹ = 141504221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142028539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1449222 + ... + 1449319.

It is an arithmetic number, because the mean of its divisors is an integer number (27536149).

Almost surely, 2^142028509 is an apocalyptic number.

It is an amenable number.

142028509 is a deficient number, since it is larger than the sum of its proper divisors (23188385).

142028509 is an equidigital number, since it uses as much as digits as its factorization.

142028509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898555 (or 2898548 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 142028509 is about 11917.5714388461. The cubic root of 142028509 is about 521.7452564702.

It can be divided in two parts, 1420 and 28509, that added together give a square (29929 = 173²).

The spelling of 142028509 in words is "one hundred forty-two million, twenty-eight thousand, five hundred nine".