256215 has 32 divisors (see below), whose sum is σ = 460800. Its totient is φ = 120960.

The previous prime is 256211. The next prime is 256219. The reversal of 256215 is 512652.

It is an interprime number because it is at equal distance from previous prime (256211) and next prime (256219).

It is not a de Polignac number, because 256215 - 2² = 256211 is a prime.

It is a super-2 number, since 2×256215² = 131292252450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256191 and 256200.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256215.

It is not an unprimeable number, because it can be changed into a prime (256211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8250 + ... + 8280.

It is an arithmetic number, because the mean of its divisors is an integer number (14400).

2²⁵⁶²¹⁵ is an apocalyptic number.

256215 is a deficient number, since it is larger than the sum of its proper divisors (204585).

256215 is a wasteful number, since it uses less digits than its factorization.

256215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87.

The product of its digits is 600, while the sum is 21.

The square root of 256215 is about 506.1768465665. The cubic root of 256215 is about 63.5138126895.

Adding to 256215 its reverse (512652), we get a palindrome (768867).

The spelling of 256215 in words is "two hundred fifty-six thousand, two hundred fifteen".