256425 has 24 divisors (see below), whose sum is σ = 458304. Its totient is φ = 125760.

The previous prime is 256423. The next prime is 256441. The reversal of 256425 is 524652.

It is not a de Polignac number, because 256425 - 2¹ = 256423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256395 and 256404.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256425.

It is not an unprimeable number, because it can be changed into a prime (256423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 844 + ... + 1106.

It is an arithmetic number, because the mean of its divisors is an integer number (19096).

2²⁵⁶⁴²⁵ is an apocalyptic number.

256425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256425 is a deficient number, since it is larger than the sum of its proper divisors (201879).

256425 is a wasteful number, since it uses less digits than its factorization.

256425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 284 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 256425 is about 506.3842414610. The cubic root of 256425 is about 63.5311604356.

The spelling of 256425 in words is "two hundred fifty-six thousand, four hundred twenty-five".