249669 has 16 divisors (see below), whose sum is σ = 423040. Its totient is φ = 142560.

The previous prime is 249659. The next prime is 249671. The reversal of 249669 is 966942.

It is not a de Polignac number, because 249669 - 2⁷ = 249541 is a prime.

It is a super-2 number, since 2×249669² = 124669219122, which contains 22 as substring.

It is a Duffinian number.

249669 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472 + ... + 849.

It is an arithmetic number, because the mean of its divisors is an integer number (26440).

2²⁴⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

249669 is a deficient number, since it is larger than the sum of its proper divisors (173371).

249669 is a wasteful number, since it uses less digits than its factorization.

249669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337 (or 1331 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 249669 is about 499.6688903664. The cubic root of 249669 is about 62.9682379578.

The spelling of 249669 in words is "two hundred forty-nine thousand, six hundred sixty-nine".