425989 has 2 divisors, whose sum is σ = 425990. Its totient is φ = 425988.

The previous prime is 425987. The next prime is 426007. The reversal of 425989 is 989524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216225 + 209764 = 465^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 425989 - 2¹ = 425987 is a prime.

Together with 425987, it forms a pair of twin primes.

425989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212994 + 212995.

It is an arithmetic number, because the mean of its divisors is an integer number (212995).

2⁴²⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

425989 is a deficient number, since it is larger than the sum of its proper divisors (1).

425989 is an equidigital number, since it uses as much as digits as its factorization.

425989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 425989 is about 652.6783281219. The cubic root of 425989 is about 75.2430043938.

The spelling of 425989 in words is "four hundred twenty-five thousand, nine hundred eighty-nine".