249668 has 6 divisors (see below), whose sum is σ = 436926. Its totient is φ = 124832.

The previous prime is 249659. The next prime is 249671. The reversal of 249668 is 866942.

249668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 135424 + 114244 = 368^2 + 338^2 .

It is a super-2 number, since 2×249668² = 124668220448, which contains 22 as substring.

It is an unprimeable number.

249668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31205 + ... + 31212.

It is an arithmetic number, because the mean of its divisors is an integer number (72821).

2²⁴⁹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

249668 is a deficient number, since it is larger than the sum of its proper divisors (187258).

249668 is a wasteful number, since it uses less digits than its factorization.

249668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62421 (or 62419 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 249668 is about 499.6678897028. The cubic root of 249668 is about 62.9681538887.

The spelling of 249668 in words is "two hundred forty-nine thousand, six hundred sixty-eight".