249889 has 4 divisors (see below), whose sum is σ = 251056. Its totient is φ = 248724.

The previous prime is 249881. The next prime is 249911. The reversal of 249889 is 988942.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 988942 = 2 ⋅494471.

It is a cyclic number.

It is not a de Polignac number, because 249889 - 2³ = 249881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249881) 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, 159 + ... + 724.

It is an arithmetic number, because the mean of its divisors is an integer number (62764).

2²⁴⁹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

249889 is a deficient number, since it is larger than the sum of its proper divisors (1167).

249889 is an equidigital number, since it uses as much as digits as its factorization.

249889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166.

The product of its digits is 41472, while the sum is 40.

The square root of 249889 is about 499.8889876763. Note that the first 3 decimals coincide. The cubic root of 249889 is about 62.9867276988.

The spelling of 249889 in words is "two hundred forty-nine thousand, eight hundred eighty-nine".