249679 has 8 divisors (see below), whose sum is σ = 278640. Its totient is φ = 222336.

The previous prime is 249677. The next prime is 249703. The reversal of 249679 is 976942.

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

It is a cyclic number.

It is not a de Polignac number, because 249679 - 2¹ = 249677 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 4 + 6³ + 9 + 7⁶ + 9³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249671) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 64 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (34830).

2²⁴⁹⁶⁷⁹ is an apocalyptic number.

249679 is a deficient number, since it is larger than the sum of its proper divisors (28961).

249679 is a wasteful number, since it uses less digits than its factorization.

249679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809.

The product of its digits is 27216, while the sum is 37.

The square root of 249679 is about 499.6788968928. The cubic root of 249679 is about 62.9690786362.

It can be divided in two parts, 24967 and 9, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 249679 in words is "two hundred forty-nine thousand, six hundred seventy-nine".