427969 has 2 divisors, whose sum is σ = 427970. Its totient is φ = 427968.

The previous prime is 427967. The next prime is 427991. The reversal of 427969 is 969724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330625 + 97344 = 575^2 + 312^2 .

It is a cyclic number.

It is not a de Polignac number, because 427969 - 2¹ = 427967 is a prime.

It is a super-2 number, since 2×427969² = 366314929922, which contains 22 as substring.

Together with 427967, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 4³ + 2¹⁷ + 9 + 7⁵ + 6⁷ + 9² .

427969 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (427967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213984 + 213985.

It is an arithmetic number, because the mean of its divisors is an integer number (213985).

2⁴²⁷⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

427969 is a deficient number, since it is larger than the sum of its proper divisors (1).

427969 is an equidigital number, since it uses as much as digits as its factorization.

427969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 427969 is about 654.1933964815. The cubic root of 427969 is about 75.3594009213.

The spelling of 427969 in words is "four hundred twenty-seven thousand, nine hundred sixty-nine".