142423009 has 4 divisors (see below), whose sum is σ = 145735216. Its totient is φ = 139110804.

The previous prime is 142422979. The next prime is 142423013. The reversal of 142423009 is 900324241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 900324241 = 461 ⋅1952981.

It is a cyclic number.

It is not a de Polignac number, because 142423009 - 2¹¹ = 142420961 is a prime.

It is a super-2 number, since 2×142423009² = 40568626985228162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142423609) 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, 1656039 + ... + 1656124.

It is an arithmetic number, because the mean of its divisors is an integer number (36433804).

Almost surely, 2^142423009 is an apocalyptic number.

It is an amenable number.

142423009 is a deficient number, since it is larger than the sum of its proper divisors (3312207).

142423009 is an equidigital number, since it uses as much as digits as its factorization.

142423009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312206.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 142423009 is about 11934.1111524906. Note that the first 4 decimals coincide. The cubic root of 142423009 is about 522.2278784174.

The spelling of 142423009 in words is "one hundred forty-two million, four hundred twenty-three thousand, nine".