142643239 has 2 divisors, whose sum is σ = 142643240. Its totient is φ = 142643238.

The previous prime is 142643233. The next prime is 142643287. The reversal of 142643239 is 932346241.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (932346241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142643239 - 2³ = 142643231 is a prime.

It is a super-2 number, since 2×142643239² = 40694187264822242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142643231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71321619 + 71321620.

It is an arithmetic number, because the mean of its divisors is an integer number (71321620).

Almost surely, 2^142643239 is an apocalyptic number.

142643239 is a deficient number, since it is larger than the sum of its proper divisors (1).

142643239 is an equidigital number, since it uses as much as digits as its factorization.

142643239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 34.

The square root of 142643239 is about 11943.3345008837. The cubic root of 142643239 is about 522.4969150402.

The spelling of 142643239 in words is "one hundred forty-two million, six hundred forty-three thousand, two hundred thirty-nine".