249728 has 16 divisors (see below), whose sum is σ = 497760. Its totient is φ = 124800.

The previous prime is 249727. The next prime is 249737. The reversal of 249728 is 827942.

249728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 249694 and 249703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 848 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (31110).

2²⁴⁹⁷²⁸ is an apocalyptic number.

It is an amenable number.

249728 is a deficient number, since it is larger than the sum of its proper divisors (248032).

249728 is an equidigital number, since it uses as much as digits as its factorization.

249728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965 (or 1953 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 249728 is about 499.7279259757. The cubic root of 249728 is about 62.9731976357.

The spelling of 249728 in words is "two hundred forty-nine thousand, seven hundred twenty-eight".