142436989 has 2 divisors, whose sum is σ = 142436990. Its totient is φ = 142436988.

The previous prime is 142436981. The next prime is 142437011. The reversal of 142436989 is 989634241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135908964 + 6528025 = 11658^2 + 2555^2 .

It is an emirp because it is prime and its reverse (989634241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142436989 - 2³ = 142436981 is a prime.

It is a super-2 number, since 2×142436989² = 40576591670772242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142436981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71218494 + 71218495.

It is an arithmetic number, because the mean of its divisors is an integer number (71218495).

Almost surely, 2^142436989 is an apocalyptic number.

It is an amenable number.

142436989 is a deficient number, since it is larger than the sum of its proper divisors (1).

142436989 is an equidigital number, since it uses as much as digits as its factorization.

142436989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 142436989 is about 11934.6968541308. The cubic root of 142436989 is about 522.2449648580.

The spelling of 142436989 in words is "one hundred forty-two million, four hundred thirty-six thousand, nine hundred eighty-nine".