427681 has 2 divisors, whose sum is σ = 427682. Its totient is φ = 427680.

The previous prime is 427621. The next prime is 427711. The reversal of 427681 is 186724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349281 + 78400 = 591^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 427681 - 2⁹ = 427169 is a prime.

It is a super-2 number, since 2×427681² = 365822075522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213840 + 213841.

It is an arithmetic number, because the mean of its divisors is an integer number (213841).

2⁴²⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

427681 is a deficient number, since it is larger than the sum of its proper divisors (1).

427681 is an equidigital number, since it uses as much as digits as its factorization.

427681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 427681 is about 653.9732410428. The cubic root of 427681 is about 75.3424928604.

The spelling of 427681 in words is "four hundred twenty-seven thousand, six hundred eighty-one".