142443989 has 2 divisors, whose sum is σ = 142443990. Its totient is φ = 142443988.

The previous prime is 142443979. The next prime is 142444021. The reversal of 142443989 is 989344241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101163364 + 41280625 = 10058^2 + 6425^2 .

It is a cyclic number.

It is not a de Polignac number, because 142443989 - 2⁸ = 142443733 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142443919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71221994 + 71221995.

It is an arithmetic number, because the mean of its divisors is an integer number (71221995).

Almost surely, 2^142443989 is an apocalyptic number.

It is an amenable number.

142443989 is a deficient number, since it is larger than the sum of its proper divisors (1).

142443989 is an equidigital number, since it uses as much as digits as its factorization.

142443989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 142443989 is about 11934.9901131086. The cubic root of 142443989 is about 522.2535198804.

The spelling of 142443989 in words is "one hundred forty-two million, four hundred forty-three thousand, nine hundred eighty-nine".