427789 has 2 divisors, whose sum is σ = 427790. Its totient is φ = 427788.

The previous prime is 427787. The next prime is 427813. The reversal of 427789 is 987724.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412164 + 15625 = 642^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 427789 - 2¹ = 427787 is a prime.

Together with 427787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213894 + 213895.

It is an arithmetic number, because the mean of its divisors is an integer number (213895).

2⁴²⁷⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

427789 is a deficient number, since it is larger than the sum of its proper divisors (1).

427789 is an equidigital number, since it uses as much as digits as its factorization.

427789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 427789 is about 654.0558080164. The cubic root of 427789 is about 75.3488342725.

It can be divided in two parts, 4 and 27789, that multiplied together give a triangular number (111156 = T₄₇₁).

The spelling of 427789 in words is "four hundred twenty-seven thousand, seven hundred eighty-nine".