249781868 has 24 divisors (see below), whose sum is σ = 501091584. Its totient is φ = 106722000.

The previous prime is 249781853. The next prime is 249781871. The reversal of 249781868 is 868187942.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4208 + ... + 22743.

It is an arithmetic number, because the mean of its divisors is an integer number (20878816).

Almost surely, 2^249781868 is an apocalyptic number.

249781868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

249781868 is an abundant number, since it is smaller than the sum of its proper divisors (251309716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249781868 is a wasteful number, since it uses less digits than its factorization.

249781868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27293 (or 27291 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 53.

The square root of 249781868 is about 15804.4888560181. The cubic root of 249781868 is about 629.7772522346. Note that the first 3 decimals are identical.

The spelling of 249781868 in words is "two hundred forty-nine million, seven hundred eighty-one thousand, eight hundred sixty-eight".