249405 has 16 divisors (see below), whose sum is σ = 430080. Its totient is φ = 122688.

The previous prime is 249397. The next prime is 249419. The reversal of 249405 is 504942.

It is not a de Polignac number, because 249405 - 2³ = 249397 is a prime.

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 249405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445 + ... + 834.

It is an arithmetic number, because the mean of its divisors is an integer number (26880).

2²⁴⁹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

249405 is a deficient number, since it is larger than the sum of its proper divisors (180675).

249405 is a wasteful number, since it uses less digits than its factorization.

249405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 249405 is about 499.4046455531. The cubic root of 249405 is about 62.9460359256.

The spelling of 249405 in words is "two hundred forty-nine thousand, four hundred five".