249868805 has 8 divisors (see below), whose sum is σ = 317480472. Its totient is φ = 188136448.

The previous prime is 249868793. The next prime is 249868811. The reversal of 249868805 is 508868942.

It can be written as a sum of positive squares in 4 ways, for example, as 75655204 + 174213601 = 8698^2 + 13199^2 .

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 249868805 - 2⁴ = 249868789 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1469732 + ... + 1469901.

It is an arithmetic number, because the mean of its divisors is an integer number (39685059).

Almost surely, 2^249868805 is an apocalyptic number.

It is an amenable number.

249868805 is a deficient number, since it is larger than the sum of its proper divisors (67611667).

249868805 is a wasteful number, since it uses less digits than its factorization.

249868805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939655.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The square root of 249868805 is about 15807.2390062275. The cubic root of 249868805 is about 629.8503087707.

The spelling of 249868805 in words is "two hundred forty-nine million, eight hundred sixty-eight thousand, eight hundred five".