288623989 has 2 divisors, whose sum is σ = 288623990. Its totient is φ = 288623988.

The previous prime is 288623971. The next prime is 288623999. The reversal of 288623989 is 989326882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176624100 + 111999889 = 13290^2 + 10583^2 .

It is a cyclic number.

It is not a de Polignac number, because 288623989 - 2¹⁵ = 288591221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (288623999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144311994 + 144311995.

It is an arithmetic number, because the mean of its divisors is an integer number (144311995).

Almost surely, 2^288623989 is an apocalyptic number.

It is an amenable number.

288623989 is a deficient number, since it is larger than the sum of its proper divisors (1).

288623989 is an equidigital number, since it uses as much as digits as its factorization.

288623989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 55.

The square root of 288623989 is about 16988.9372534011. The cubic root of 288623989 is about 660.8620423841.

The spelling of 288623989 in words is "two hundred eighty-eight million, six hundred twenty-three thousand, nine hundred eighty-nine".