249409 has 4 divisors (see below), whose sum is σ = 250416. Its totient is φ = 248404.

The previous prime is 249397. The next prime is 249419. The reversal of 249409 is 904942.

249409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 249409 - 2⁵ = 249377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249419) 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, 162 + ... + 724.

It is an arithmetic number, because the mean of its divisors is an integer number (62604).

2²⁴⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

249409 is a deficient number, since it is larger than the sum of its proper divisors (1007).

249409 is an equidigital number, since it uses as much as digits as its factorization.

249409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 249409 is about 499.4086503055. The cubic root of 249409 is about 62.9463724369.

The spelling of 249409 in words is "two hundred forty-nine thousand, four hundred nine".