142404209 has 2 divisors, whose sum is σ = 142404210. Its totient is φ = 142404208.

The previous prime is 142404167. The next prime is 142404233. The reversal of 142404209 is 902404241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116035984 + 26368225 = 10772^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 142404209 - 2¹² = 142400113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142409209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71202104 + 71202105.

It is an arithmetic number, because the mean of its divisors is an integer number (71202105).

Almost surely, 2^142404209 is an apocalyptic number.

It is an amenable number.

142404209 is a deficient number, since it is larger than the sum of its proper divisors (1).

142404209 is an equidigital number, since it uses as much as digits as its factorization.

142404209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 142404209 is about 11933.3234683386. The cubic root of 142404209 is about 522.2048991806.

The spelling of 142404209 in words is "one hundred forty-two million, four hundred four thousand, two hundred nine".