180638789 has 2 divisors, whose sum is σ = 180638790. Its totient is φ = 180638788.

The previous prime is 180638729. The next prime is 180638797. The reversal of 180638789 is 987836081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102616900 + 78021889 = 10130^2 + 8833^2 .

It is a cyclic number.

It is not a de Polignac number, because 180638789 - 2⁸ = 180638533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180638729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90319394 + 90319395.

It is an arithmetic number, because the mean of its divisors is an integer number (90319395).

Almost surely, 2^180638789 is an apocalyptic number.

It is an amenable number.

180638789 is a deficient number, since it is larger than the sum of its proper divisors (1).

180638789 is an equidigital number, since it uses as much as digits as its factorization.

180638789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 180638789 is about 13440.1930417684. The cubic root of 180638789 is about 565.2887437375.

The spelling of 180638789 in words is "one hundred eighty million, six hundred thirty-eight thousand, seven hundred eighty-nine".