426781 has 4 divisors (see below), whose sum is σ = 432864. Its totient is φ = 420700.

The previous prime is 426779. The next prime is 426787. The reversal of 426781 is 187624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 426781 - 2¹ = 426779 is a prime.

It is a super-2 number, since 2×426781² = 364284043922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2935 + ... + 3076.

It is an arithmetic number, because the mean of its divisors is an integer number (108216).

2⁴²⁶⁷⁸¹ is an apocalyptic number.

It is an amenable number.

426781 is a deficient number, since it is larger than the sum of its proper divisors (6083).

426781 is an equidigital number, since it uses as much as digits as its factorization.

426781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6082.

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

The square root of 426781 is about 653.2847771072. The cubic root of 426781 is about 75.2896061965.

The spelling of 426781 in words is "four hundred twenty-six thousand, seven hundred eighty-one".