426821489 has 2 divisors, whose sum is σ = 426821490. Its totient is φ = 426821488.

The previous prime is 426821467. The next prime is 426821497. The reversal of 426821489 is 984128624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413919025 + 12902464 = 20345^2 + 3592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426821489 is a prime.

It is not a weakly prime, because it can be changed into another prime (426821459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213410744 + 213410745.

It is an arithmetic number, because the mean of its divisors is an integer number (213410745).

Almost surely, 2^426821489 is an apocalyptic number.

It is an amenable number.

426821489 is a deficient number, since it is larger than the sum of its proper divisors (1).

426821489 is an equidigital number, since it uses as much as digits as its factorization.

426821489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 44.

The square root of 426821489 is about 20659.6584918532. The cubic root of 426821489 is about 752.9198704642.

The spelling of 426821489 in words is "four hundred twenty-six million, eight hundred twenty-one thousand, four hundred eighty-nine".