249939 has 8 divisors (see below), whose sum is σ = 370320. Its totient is φ = 166608.

The previous prime is 249923. The next prime is 249943. The reversal of 249939 is 939942.

249939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 249939 - 2⁴ = 249923 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249939.

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, 4602 + ... + 4655.

It is an arithmetic number, because the mean of its divisors is an integer number (46290).

2²⁴⁹⁹³⁹ is an apocalyptic number.

249939 is a deficient number, since it is larger than the sum of its proper divisors (120381).

249939 is an equidigital number, since it uses as much as digits as its factorization.

249939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9266 (or 9260 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 249939 is about 499.9389962785. The cubic root of 249939 is about 62.9909283990.

It can be divided in two parts, 2499 and 39, that multiplied together give a triangular number (97461 = T₄₄₁).

The spelling of 249939 in words is "two hundred forty-nine thousand, nine hundred thirty-nine".