249869 has 4 divisors (see below), whose sum is σ = 263040. Its totient is φ = 236700.

The previous prime is 249863. The next prime is 249871. The reversal of 249869 is 968942.

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 249869 - 2⁴ = 249853 is a prime.

It is a super-2 number, since 2×249869² = 124869034322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249869.

It is not an unprimeable number, because it can be changed into a prime (249863) 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, 6557 + ... + 6594.

It is an arithmetic number, because the mean of its divisors is an integer number (65760).

2²⁴⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

249869 is a deficient number, since it is larger than the sum of its proper divisors (13171).

249869 is a wasteful number, since it uses less digits than its factorization.

249869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13170.

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

The square root of 249869 is about 499.8689828345. The cubic root of 249869 is about 62.9850472618.

The spelling of 249869 in words is "two hundred forty-nine thousand, eight hundred sixty-nine".