256384634 has 16 divisors (see below), whose sum is σ = 437780160. Its totient is φ = 111471360.

The previous prime is 256384631. The next prime is 256384643. The reversal of 256384634 is 436483652.

It is a junction number, because it is equal to n+sod(n) for n = 256384591 and 256384600.

It is not an unprimeable number, because it can be changed into a prime (256384631) 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, 252839 + ... + 253850.

It is an arithmetic number, because the mean of its divisors is an integer number (27361260).

Almost surely, 2^256384634 is an apocalyptic number.

256384634 is a deficient number, since it is larger than the sum of its proper divisors (181395526).

256384634 is a wasteful number, since it uses less digits than its factorization.

256384634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506725.

The product of its digits is 414720, while the sum is 41.

The square root of 256384634 is about 16012.0153010169. The cubic root of 256384634 is about 635.2782660388.

The spelling of 256384634 in words is "two hundred fifty-six million, three hundred eighty-four thousand, six hundred thirty-four".