256693 has 4 divisors (see below), whose sum is σ = 259200. Its totient is φ = 254188.
The previous prime is 256687. The next prime is 256699. The reversal of 256693 is 396652.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is an interprime number because it is at equal distance from previous prime (256687) and next prime (256699).
It is a cyclic number.
It is not a de Polignac number, because 256693 - 25 = 256661 is a prime.
It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a d-powerful number, because it can be written as 23 + 57 + 62 + 64 + 92 + 311 .
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (256699) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093 + ... + 1306.
It is an arithmetic number, because the mean of its divisors is an integer number (64800).
2256693 is an apocalyptic number.
It is an amenable number.
256693 is a deficient number, since it is larger than the sum of its proper divisors (2507).
256693 is a wasteful number, since it uses less digits than its factorization.
256693 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2506.
The product of its digits is 9720, while the sum is 31.
The square root of 256693 is about 506.6487935444. The cubic root of 256693 is about 63.5532857130.
It can be divided in two parts, 256 and 693, that added together give a palindrome (949).
The spelling of 256693 in words is "two hundred fifty-six thousand, six hundred ninety-three".
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