249999 has 8 divisors (see below), whose sum is σ = 336000.
Its totient is φ = 165336.
The previous prime is 249989. The next prime is 250007. The reversal of 249999 is 999942.
It is a Cunningham number, because it is equal to 5002-1.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 249999 - 25 = 249967 is a prime.
It is a D-number.
249999 is a modest number, since divided by 999 gives 249 as remainder.
It is a plaindrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 249999.
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 249999.
It is not an unprimeable number, because it can be changed into a prime (249989) 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, 252 + ... + 750.
It is an arithmetic number, because the mean of its divisors is an integer number (42000).
2249999 is an apocalyptic number.
249999 is a deficient number, since it is larger than the sum of its proper divisors (86001).
249999 is a wasteful number, since it uses less digits than its factorization.
249999 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 669.
The product of its digits is 52488, while the sum is 42.
The square root of 249999 is about 499.9989999990.
The cubic root of 249999 is about 62.9959684999.
The spelling of 249999 in words is "two hundred forty-nine thousand, nine hundred ninety-nine".