249389863 has 4 divisors (see below), whose sum is σ = 249746328. Its totient is φ = 249033400.

The previous prime is 249389831. The next prime is 249389869. The reversal of 249389863 is 368983942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368983942 = 2 ⋅184491971.

It is a cyclic number.

It is not a de Polignac number, because 249389863 - 2⁵ = 249389831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249389863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249389869) 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, 177181 + ... + 178582.

It is an arithmetic number, because the mean of its divisors is an integer number (62436582).

Almost surely, 2^249389863 is an apocalyptic number.

249389863 is a deficient number, since it is larger than the sum of its proper divisors (356465).

249389863 is an equidigital number, since it uses as much as digits as its factorization.

249389863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356464.

The product of its digits is 2239488, while the sum is 52.

The square root of 249389863 is about 15792.0822882861. The cubic root of 249389863 is about 629.4476245017.

The spelling of 249389863 in words is "two hundred forty-nine million, three hundred eighty-nine thousand, eight hundred sixty-three".