426209 has 4 divisors (see below), whose sum is σ = 487104. Its totient is φ = 365316.

The previous prime is 426197. The next prime is 426211. The reversal of 426209 is 902624.

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 not a de Polignac number, because 426209 - 2⁴ = 426193 is a prime.

It is a super-2 number, since 2×426209² = 363308223362, which contains 22 as substring.

It is a d-powerful number, because it can be written as 4⁹ + 2¹⁵ + 2¹⁷ + 6³ + 0 + 9 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (426229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30437 + ... + 30450.

It is an arithmetic number, because the mean of its divisors is an integer number (121776).

2⁴²⁶²⁰⁹ is an apocalyptic number.

It is an amenable number.

426209 is a deficient number, since it is larger than the sum of its proper divisors (60895).

426209 is an equidigital number, since it uses as much as digits as its factorization.

426209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60894.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 426209 is about 652.8468426821. The cubic root of 426209 is about 75.2559551289.

The spelling of 426209 in words is "four hundred twenty-six thousand, two hundred nine".