249842 has 8 divisors (see below), whose sum is σ = 381996. Its totient is φ = 122512.

The previous prime is 249833. The next prime is 249853. The reversal of 249842 is 248942.

It can be written as a sum of positive squares in 2 ways, for example, as 249001 + 841 = 499^2 + 29^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

249842 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 1284.

2²⁴⁹⁸⁴² is an apocalyptic number.

249842 is a deficient number, since it is larger than the sum of its proper divisors (132154).

249842 is a wasteful number, since it uses less digits than its factorization.

249842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412.

The product of its digits is 4608, while the sum is 29.

The square root of 249842 is about 499.8419750281. The cubic root of 249842 is about 62.9827785296.

Subtracting from 249842 its reverse (248942), we obtain a square (900 = 30²).

The spelling of 249842 in words is "two hundred forty-nine thousand, eight hundred forty-two".