249957745 has 4 divisors (see below), whose sum is σ = 299949300. Its totient is φ = 199966192.

The previous prime is 249957727. The next prime is 249957779. The reversal of 249957745 is 547759942.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165096801 + 84860944 = 12849^2 + 9212^2 .

It is a cyclic number.

It is not a de Polignac number, because 249957745 - 2⁵ = 249957713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249957692 and 249957701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24995770 + ... + 24995779.

It is an arithmetic number, because the mean of its divisors is an integer number (74987325).

Almost surely, 2^249957745 is an apocalyptic number.

It is an amenable number.

249957745 is a deficient number, since it is larger than the sum of its proper divisors (49991555).

249957745 is an equidigital number, since it uses as much as digits as its factorization.

249957745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49991554.

The product of its digits is 3175200, while the sum is 52.

The square root of 249957745 is about 15810.0520239498. The cubic root of 249957745 is about 629.9250309717.

The spelling of 249957745 in words is "two hundred forty-nine million, nine hundred fifty-seven thousand, seven hundred forty-five".