426421 has 2 divisors, whose sum is σ = 426422. Its totient is φ = 426420.

The previous prime is 426407. The next prime is 426427. The reversal of 426421 is 124624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255025 + 171396 = 505^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 426421 - 2⁵ = 426389 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213210 + 213211.

It is an arithmetic number, because the mean of its divisors is an integer number (213211).

2⁴²⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

426421 is a deficient number, since it is larger than the sum of its proper divisors (1).

426421 is an equidigital number, since it uses as much as digits as its factorization.

426421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 19.

The square root of 426421 is about 653.0091882968. The cubic root of 426421 is about 75.2684307124.

The spelling of 426421 in words is "four hundred twenty-six thousand, four hundred twenty-one".