249479 has 4 divisors (see below), whose sum is σ = 250584. Its totient is φ = 248376.

The previous prime is 249463. The next prime is 249497. The reversal of 249479 is 974942.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 974942 = 2 ⋅487471.

It is a cyclic number.

It is not a de Polignac number, because 249479 - 2⁴ = 249463 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 4 + 4² + 9 + 7⁶ + 9³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249419) 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, 77 + ... + 710.

It is an arithmetic number, because the mean of its divisors is an integer number (62646).

2²⁴⁹⁴⁷⁹ is an apocalyptic number.

249479 is a deficient number, since it is larger than the sum of its proper divisors (1105).

249479 is an equidigital number, since it uses as much as digits as its factorization.

249479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104.

The product of its digits is 18144, while the sum is 35.

The square root of 249479 is about 499.4787282758. The cubic root of 249479 is about 62.9522608022.

The spelling of 249479 in words is "two hundred forty-nine thousand, four hundred seventy-nine".