256434243 has 8 divisors (see below), whose sum is σ = 368213328. Its totient is φ = 157805664.

The previous prime is 256434229. The next prime is 256434257. The reversal of 256434243 is 342434652.

It is an interprime number because it is at equal distance from previous prime (256434229) and next prime (256434257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256434243 - 2⁹ = 256433731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256434293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3287580 + ... + 3287657.

It is an arithmetic number, because the mean of its divisors is an integer number (46026666).

Almost surely, 2^256434243 is an apocalyptic number.

256434243 is a deficient number, since it is larger than the sum of its proper divisors (111779085).

256434243 is a wasteful number, since it uses less digits than its factorization.

256434243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6575253.

The product of its digits is 69120, while the sum is 33.

The square root of 256434243 is about 16013.5643440179. The cubic root of 256434243 is about 635.3192376661.

Adding to 256434243 its reverse (342434652), we get a palindrome (598868895).

The spelling of 256434243 in words is "two hundred fifty-six million, four hundred thirty-four thousand, two hundred forty-three".