249689 has 4 divisors (see below), whose sum is σ = 272400. Its totient is φ = 226980.

The previous prime is 249677. The next prime is 249703. The reversal of 249689 is 986942.

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 a cyclic number.

It is not a de Polignac number, because 249689 - 2⁸ = 249433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249659) 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, 11339 + ... + 11360.

It is an arithmetic number, because the mean of its divisors is an integer number (68100).

2²⁴⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

249689 is a deficient number, since it is larger than the sum of its proper divisors (22711).

249689 is a wasteful number, since it uses less digits than its factorization.

249689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22710.

The product of its digits is 31104, while the sum is 38.

The square root of 249689 is about 499.6889032188. The cubic root of 249689 is about 62.9699192921.

The spelling of 249689 in words is "two hundred forty-nine thousand, six hundred eighty-nine".