256434945 has 64 divisors (see below), whose sum is σ = 464486400. Its totient is φ = 119934720.

The previous prime is 256434943. The next prime is 256434947. The reversal of 256434945 is 549434652.

It is an interprime number because it is at equal distance from previous prime (256434943) and next prime (256434947).

It is not a de Polignac number, because 256434945 - 2¹ = 256434943 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256434897 and 256434906.

It is not an unprimeable number, because it can be changed into a prime (256434943) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 356296 + ... + 357014.

It is an arithmetic number, because the mean of its divisors is an integer number (7257600).

Almost surely, 2^256434945 is an apocalyptic number.

It is an amenable number.

256434945 is a deficient number, since it is larger than the sum of its proper divisors (208051455).

256434945 is a wasteful number, since it uses less digits than its factorization.

256434945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830.

The product of its digits is 518400, while the sum is 42.

The square root of 256434945 is about 16013.5862629206. The cubic root of 256434945 is about 635.3198174037.

The spelling of 256434945 in words is "two hundred fifty-six million, four hundred thirty-four thousand, nine hundred forty-five".