249405853 has 4 divisors (see below), whose sum is σ = 249437440. Its totient is φ = 249374268.

The previous prime is 249405851. The next prime is 249405883. The reversal of 249405853 is 358504942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 249405853 - 2¹ = 249405851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249405851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7726 + ... + 23632.

It is an arithmetic number, because the mean of its divisors is an integer number (62359360).

Almost surely, 2^249405853 is an apocalyptic number.

It is an amenable number.

249405853 is a deficient number, since it is larger than the sum of its proper divisors (31587).

249405853 is a wasteful number, since it uses less digits than its factorization.

249405853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31586.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 249405853 is about 15792.5885465303. The cubic root of 249405853 is about 629.4610768694.

The spelling of 249405853 in words is "two hundred forty-nine million, four hundred five thousand, eight hundred fifty-three".