249890 has 8 divisors (see below), whose sum is σ = 449820. Its totient is φ = 99952.

The previous prime is 249881. The next prime is 249911. The reversal of 249890 is 98942.

It can be written as a sum of positive squares in 2 ways, for example, as 229441 + 20449 = 479^2 + 143^2 .

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

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

249890 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12485 + ... + 12504.

2²⁴⁹⁸⁹⁰ is an apocalyptic number.

249890 is a deficient number, since it is larger than the sum of its proper divisors (199930).

249890 is a wasteful number, since it uses less digits than its factorization.

249890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24996.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 249890 is about 499.8899878973. The cubic root of 249890 is about 62.9868117183.

The spelling of 249890 in words is "two hundred forty-nine thousand, eight hundred ninety".