142240009 has 2 divisors, whose sum is σ = 142240010. Its totient is φ = 142240008.

The previous prime is 142239971. The next prime is 142240039. The reversal of 142240009 is 900042241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97081609 + 45158400 = 9853^2 + 6720^2 .

It is a cyclic number.

It is not a de Polignac number, because 142240009 - 2⁹ = 142239497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142240039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71120004 + 71120005.

It is an arithmetic number, because the mean of its divisors is an integer number (71120005).

Almost surely, 2^142240009 is an apocalyptic number.

It is an amenable number.

142240009 is a deficient number, since it is larger than the sum of its proper divisors (1).

142240009 is an equidigital number, since it uses as much as digits as its factorization.

142240009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 142240009 is about 11926.4415900133. The cubic root of 142240009 is about 522.0041115240.

The spelling of 142240009 in words is "one hundred forty-two million, two hundred forty thousand, nine".