142739009 has 6 divisors (see below), whose sum is σ = 166043394. Its totient is φ = 122347680.

The previous prime is 142738997. The next prime is 142739027. The reversal of 142739009 is 900937241.

It can be written as a sum of positive squares in only one way, i.e., 80281600 + 62457409 = 8960^2 + 7903^2 .

It is not a de Polignac number, because 142739009 - 2¹⁶ = 142673473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142739009.

It is not an unprimeable number, because it can be changed into a prime (142739099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1456472 + ... + 1456569.

It is an arithmetic number, because the mean of its divisors is an integer number (27673899).

Almost surely, 2^142739009 is an apocalyptic number.

It is an amenable number.

142739009 is a deficient number, since it is larger than the sum of its proper divisors (23304385).

142739009 is an equidigital number, since it uses as much as digits as its factorization.

142739009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913055 (or 2913048 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 142739009 is about 11947.3431774600. The cubic root of 142739009 is about 522.6138228710.

The spelling of 142739009 in words is "one hundred forty-two million, seven hundred thirty-nine thousand, nine".