249821648 has 40 divisors (see below), whose sum is σ = 496682496. Its totient is φ = 121680000.

The previous prime is 249821639. The next prime is 249821683. The reversal of 249821648 is 846128942.

It is a junction number, because it is equal to n+sod(n) for n = 249821599 and 249821608.

It is a congruent 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, 127073 + ... + 129023.

Almost surely, 2^249821648 is an apocalyptic number.

It is an amenable number.

249821648 is a deficient number, since it is larger than the sum of its proper divisors (246860848).

249821648 is a wasteful number, since it uses less digits than its factorization.

249821648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163 (or 2157 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 249821648 is about 15805.7473091278. The cubic root of 249821648 is about 629.8106830162.

The spelling of 249821648 in words is "two hundred forty-nine million, eight hundred twenty-one thousand, six hundred forty-eight".