142838989 has 2 divisors, whose sum is σ = 142838990. Its totient is φ = 142838988.

The previous prime is 142838963. The next prime is 142839001. The reversal of 142838989 is 989838241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142324900 + 514089 = 11930^2 + 717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142838989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142838929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71419494 + 71419495.

It is an arithmetic number, because the mean of its divisors is an integer number (71419495).

Almost surely, 2^142838989 is an apocalyptic number.

It is an amenable number.

142838989 is a deficient number, since it is larger than the sum of its proper divisors (1).

142838989 is an equidigital number, since it uses as much as digits as its factorization.

142838989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 52.

The square root of 142838989 is about 11951.5266388859. The cubic root of 142838989 is about 522.7358141323.

The spelling of 142838989 in words is "one hundred forty-two million, eight hundred thirty-eight thousand, nine hundred eighty-nine".