256421226 has 16 divisors (see below), whose sum is σ = 539834400. Its totient is φ = 80975088.

The previous prime is 256421213. The next prime is 256421239. The reversal of 256421226 is 622124652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256421213) and next prime (256421239).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256421193 and 256421202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1124541 + ... + 1124768.

It is an arithmetic number, because the mean of its divisors is an integer number (33739650).

Almost surely, 2^256421226 is an apocalyptic number.

256421226 is an abundant number, since it is smaller than the sum of its proper divisors (283413174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256421226 is a wasteful number, since it uses less digits than its factorization.

256421226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249333.

The product of its digits is 11520, while the sum is 30.

The square root of 256421226 is about 16013.1579021753. The cubic root of 256421226 is about 635.3084875542.

Adding to 256421226 its reverse (622124652), we get a palindrome (878545878).

The spelling of 256421226 in words is "two hundred fifty-six million, four hundred twenty-one thousand, two hundred twenty-six".