142143809 has 4 divisors (see below), whose sum is σ = 142191060. Its totient is φ = 142096560.

The previous prime is 142143797. The next prime is 142143823. The reversal of 142143809 is 908341241.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50367409 + 91776400 = 7097^2 + 9580^2 .

It is a cyclic number.

It is not a de Polignac number, because 142143809 - 2¹² = 142139713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142143889) 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, 18782 + ... + 25239.

It is an arithmetic number, because the mean of its divisors is an integer number (35547765).

Almost surely, 2^142143809 is an apocalyptic number.

It is an amenable number.

142143809 is a deficient number, since it is larger than the sum of its proper divisors (47251).

142143809 is an equidigital number, since it uses as much as digits as its factorization.

142143809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47250.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 142143809 is about 11922.4078524432. The cubic root of 142143809 is about 521.8864040870.

The spelling of 142143809 in words is "one hundred forty-two million, one hundred forty-three thousand, eight hundred nine".