249263887 has 4 divisors (see below), whose sum is σ = 255343536. Its totient is φ = 243184240.

The previous prime is 249263879. The next prime is 249263893. The reversal of 249263887 is 788362942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788362942 = 2 ⋅394181471.

It is a cyclic number.

It is not a de Polignac number, because 249263887 - 2³ = 249263879 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 249263887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249263837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3039763 + ... + 3039844.

It is an arithmetic number, because the mean of its divisors is an integer number (63835884).

Almost surely, 2^249263887 is an apocalyptic number.

249263887 is a deficient number, since it is larger than the sum of its proper divisors (6079649).

249263887 is an equidigital number, since it uses as much as digits as its factorization.

249263887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6079648.

The product of its digits is 1161216, while the sum is 49.

The square root of 249263887 is about 15788.0932034239. The cubic root of 249263887 is about 629.3416209291.

The spelling of 249263887 in words is "two hundred forty-nine million, two hundred sixty-three thousand, eight hundred eighty-seven".