249505 has 8 divisors (see below), whose sum is σ = 302400. Its totient is φ = 197616.

The previous prime is 249503. The next prime is 249517. The reversal of 249505 is 505942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 249505 - 2¹ = 249503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249505.

It is not an unprimeable number, because it can be changed into a prime (249503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516 + ... + 874.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2²⁴⁹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

249505 is a deficient number, since it is larger than the sum of its proper divisors (52895).

249505 is a wasteful number, since it uses less digits than its factorization.

249505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 249505 is about 499.5047547321. The cubic root of 249505 is about 62.9544476288.

It can be divided in two parts, 24950 and 5, that multiplied together give a triangular number (124750 = T₄₉₉).

The spelling of 249505 in words is "two hundred forty-nine thousand, five hundred five".