142306809 has 4 divisors (see below), whose sum is σ = 189742416. Its totient is φ = 94871204.

The previous prime is 142306793. The next prime is 142306867. The reversal of 142306809 is 908603241.

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 a cyclic number.

It is not a de Polignac number, because 142306809 - 2⁴ = 142306793 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 142306809.

It is not an unprimeable number, because it can be changed into a prime (142206809) 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, 23717799 + ... + 23717804.

It is an arithmetic number, because the mean of its divisors is an integer number (47435604).

Almost surely, 2^142306809 is an apocalyptic number.

It is an amenable number.

142306809 is a deficient number, since it is larger than the sum of its proper divisors (47435607).

142306809 is an equidigital number, since it uses as much as digits as its factorization.

142306809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47435606.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 142306809 is about 11929.2417613191. The cubic root of 142306809 is about 522.0858147843.

The spelling of 142306809 in words is "one hundred forty-two million, three hundred six thousand, eight hundred nine".