249866 has 8 divisors (see below), whose sum is σ = 396900. Its totient is φ = 117568.

The previous prime is 249863. The next prime is 249871. The reversal of 249866 is 668942.

It can be written as a sum of positive squares in 2 ways, for example, as 235225 + 14641 = 485^2 + 121^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249866.

It is not an unprimeable number, because it can be changed into a prime (249863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3641 + ... + 3708.

2²⁴⁹⁸⁶⁶ is an apocalyptic number.

249866 is a deficient number, since it is larger than the sum of its proper divisors (147034).

249866 is a wasteful number, since it uses less digits than its factorization.

249866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7368.

The product of its digits is 20736, while the sum is 35.

The square root of 249866 is about 499.8659820392. The cubic root of 249866 is about 62.9847951885.

The spelling of 249866 in words is "two hundred forty-nine thousand, eight hundred sixty-six".