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249988 = 2262497

249988 has 6 divisors (see below), whose sum is σ = 437486. Its totient is φ = 124992.

The previous prime is 249973. The next prime is 249989. The reversal of 249988 is 889942.

It can be divided in two parts, 2499 and 88, that multiplied together give a palindrome (219912).

It is a happy number.

249988 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 200704 + 49284 = 448^2 + 222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 249988.

It is not an unprimeable number, because it can be changed into a prime (249989) by changing a digit.

249988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31245 + ... + 31252.

2249988 is an apocalyptic number.

It is an amenable number.

249988 is a deficient number, since it is larger than the sum of its proper divisors (187498).

249988 is a wasteful number, since it uses less digits than its factorization.

249988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62501 (or 62499 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 249988 is about 499.9879998560. The cubic root of 249988 is about 62.9950445418.

The spelling of 249988 in words is "two hundred forty-nine thousand, nine hundred eighty-eight".

Divisors: 1 2 4 62497 124994 249988