255698 has 4 divisors (see below), whose sum is σ = 383550. Its totient is φ = 127848.

The previous prime is 255679. The next prime is 255709. The reversal of 255698 is 896552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 142129 + 113569 = 377^2 + 337^2 .

It is an Ulam number.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255698.

It is an unprimeable number.

255698 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63923 + ... + 63926.

2²⁵⁵⁶⁹⁸ is an apocalyptic number.

255698 is a deficient number, since it is larger than the sum of its proper divisors (127852).

255698 is a wasteful number, since it uses less digits than its factorization.

255698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127851.

The product of its digits is 21600, while the sum is 35.

The square root of 255698 is about 505.6658976043. The cubic root of 255698 is about 63.4710637582.

The spelling of 255698 in words is "two hundred fifty-five thousand, six hundred ninety-eight".