249665 has 16 divisors (see below), whose sum is σ = 338688. Its totient is φ = 175296.

The previous prime is 249659. The next prime is 249671. The reversal of 249665 is 566942.

It is an interprime number because it is at equal distance from previous prime (249659) and next prime (249671).

It is a cyclic number.

It is not a de Polignac number, because 249665 - 2¹⁰ = 248641 is a prime.

It is a super-2 number, since 2×249665² = 124665224450, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1412 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (21168).

2²⁴⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

249665 is a deficient number, since it is larger than the sum of its proper divisors (89023).

249665 is a wasteful number, since it uses less digits than its factorization.

249665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its digits is 12960, while the sum is 32.

The square root of 249665 is about 499.6648876997. The cubic root of 249665 is about 62.9679016802.

The spelling of 249665 in words is "two hundred forty-nine thousand, six hundred sixty-five".