423618389 has 2 divisors, whose sum is σ = 423618390. Its totient is φ = 423618388.

The previous prime is 423618383. The next prime is 423618397. The reversal of 423618389 is 983816324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315666289 + 107952100 = 17767^2 + 10390^2 .

It is a cyclic number.

It is not a de Polignac number, because 423618389 - 2¹⁶ = 423552853 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 (423618383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211809194 + 211809195.

It is an arithmetic number, because the mean of its divisors is an integer number (211809195).

Almost surely, 2^423618389 is an apocalyptic number.

It is an amenable number.

423618389 is a deficient number, since it is larger than the sum of its proper divisors (1).

423618389 is an equidigital number, since it uses as much as digits as its factorization.

423618389 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 423618389 is about 20581.9918618194. The cubic root of 423618389 is about 751.0316995514.

The spelling of 423618389 in words is "four hundred twenty-three million, six hundred eighteen thousand, three hundred eighty-nine".