249715 has 4 divisors (see below), whose sum is σ = 299664. Its totient is φ = 199768.

The previous prime is 249703. The next prime is 249721. The reversal of 249715 is 517942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 517942 = 2 ⋅258971.

It is a cyclic number.

It is not a de Polignac number, because 249715 - 2¹⁵ = 216947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 24967 + ... + 24976.

It is an arithmetic number, because the mean of its divisors is an integer number (74916).

2²⁴⁹⁷¹⁵ is an apocalyptic number.

249715 is a deficient number, since it is larger than the sum of its proper divisors (49949).

249715 is an equidigital number, since it uses as much as digits as its factorization.

249715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49948.

The product of its digits is 2520, while the sum is 28.

The square root of 249715 is about 499.7149187287. The cubic root of 249715 is about 62.9721048924.

It can be divided in two parts, 24971 and 5, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 249715 in words is "two hundred forty-nine thousand, seven hundred fifteen".