256340965 has 8 divisors (see below), whose sum is σ = 309569400. Its totient is φ = 203765952.

The previous prime is 256340963. The next prime is 256340969. The reversal of 256340965 is 569043652.

It can be written as a sum of positive squares in 4 ways, for example, as 3944196 + 252396769 = 1986^2 + 15887^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 256340965 - 2¹ = 256340963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256340963) 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, 162490 + ... + 164059.

It is an arithmetic number, because the mean of its divisors is an integer number (38696175).

Almost surely, 2^256340965 is an apocalyptic number.

It is an amenable number.

256340965 is a deficient number, since it is larger than the sum of its proper divisors (53228435).

256340965 is a wasteful number, since it uses less digits than its factorization.

256340965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326711.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 256340965 is about 16010.6516107247. The cubic root of 256340965 is about 635.2421958301.

The spelling of 256340965 in words is "two hundred fifty-six million, three hundred forty thousand, nine hundred sixty-five".