249667 has 4 divisors (see below), whose sum is σ = 272376. Its totient is φ = 226960.

The previous prime is 249659. The next prime is 249671. The reversal of 249667 is 766942.

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

It is a cyclic number.

It is not a de Polignac number, because 249667 - 2³ = 249659 is a prime.

It is a super-2 number, since 2×249667² = 124667221778, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249607) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 11338 + ... + 11359.

It is an arithmetic number, because the mean of its divisors is an integer number (68094).

2²⁴⁹⁶⁶⁷ is an apocalyptic number.

249667 is a deficient number, since it is larger than the sum of its proper divisors (22709).

249667 is a wasteful number, since it uses less digits than its factorization.

249667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22708.

The product of its digits is 18144, while the sum is 34.

The square root of 249667 is about 499.6668890371. Note that the first 3 decimals coincide. The cubic root of 249667 is about 62.9680698194.

The spelling of 249667 in words is "two hundred forty-nine thousand, six hundred sixty-seven".