289999999 has 2 divisors, whose sum is σ = 290000000. Its totient is φ = 289999998.

The previous prime is 289999993. The next prime is 290000017. The reversal of 289999999 is 999999982.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289999999 is a prime.

It is a Chen prime.

289999999 is a modest number, since divided by 99999 gives 2899 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289999993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144999999 + 145000000.

It is an arithmetic number, because the mean of its divisors is an integer number (145000000).

Almost surely, 2^289999999 is an apocalyptic number.

289999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

289999999 is an equidigital number, since it uses as much as digits as its factorization.

289999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76527504, while the sum is 73.

The square root of 289999999 is about 17029.3863365654. The cubic root of 289999999 is about 661.9105940418.

It can be divided in two parts, 28 and 9999999, that multiplied together give a palindrome (279999972).

The spelling of 289999999 in words is "two hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".