142342409 has 4 divisors (see below), whose sum is σ = 155282640. Its totient is φ = 129402180.

The previous prime is 142342391. The next prime is 142342457. The reversal of 142342409 is 904243241.

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: 904243241 = 11 ⋅82203931.

It is a cyclic number.

It is not a de Polignac number, because 142342409 - 2²⁰ = 141293833 is a prime.

It is a super-2 number, since 2×142342409² = 40522722799846562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142342609) 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, 6470099 + ... + 6470120.

It is an arithmetic number, because the mean of its divisors is an integer number (38820660).

Almost surely, 2^142342409 is an apocalyptic number.

It is an amenable number.

142342409 is a deficient number, since it is larger than the sum of its proper divisors (12940231).

142342409 is a wasteful number, since it uses less digits than its factorization.

142342409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12940230.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 142342409 is about 11930.7337997292. The cubic root of 142342409 is about 522.1293467968.

The spelling of 142342409 in words is "one hundred forty-two million, three hundred forty-two thousand, four hundred nine".