142723209 has 4 divisors (see below), whose sum is σ = 190297616. Its totient is φ = 95148804.

The previous prime is 142723157. The next prime is 142723213. The reversal of 142723209 is 902327241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 142723209 - 2¹⁵ = 142690441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142723219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23787199 + ... + 23787204.

It is an arithmetic number, because the mean of its divisors is an integer number (47574404).

Almost surely, 2^142723209 is an apocalyptic number.

It is an amenable number.

142723209 is a deficient number, since it is larger than the sum of its proper divisors (47574407).

142723209 is an equidigital number, since it uses as much as digits as its factorization.

142723209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47574406.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 142723209 is about 11946.6819242834. The cubic root of 142723209 is about 522.5945391841.

The spelling of 142723209 in words is "one hundred forty-two million, seven hundred twenty-three thousand, two hundred nine".