142040009 has 2 divisors, whose sum is σ = 142040010. Its totient is φ = 142040008.

The previous prime is 142039951. The next prime is 142040023. The reversal of 142040009 is 900040241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87235600 + 54804409 = 9340^2 + 7403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142040009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142040089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71020004 + 71020005.

It is an arithmetic number, because the mean of its divisors is an integer number (71020005).

Almost surely, 2^142040009 is an apocalyptic number.

It is an amenable number.

142040009 is a deficient number, since it is larger than the sum of its proper divisors (1).

142040009 is an equidigital number, since it uses as much as digits as its factorization.

142040009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 142040009 is about 11918.0539099301. The cubic root of 142040009 is about 521.7593379354.

The spelling of 142040009 in words is "one hundred forty-two million, forty thousand, nine".