249903887 has 2 divisors, whose sum is σ = 249903888. Its totient is φ = 249903886.

The previous prime is 249903821. The next prime is 249903919. The reversal of 249903887 is 788309942.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249903887 - 2¹² = 249899791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249903187) 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 as a sum of consecutive naturals, namely, 124951943 + 124951944.

It is an arithmetic number, because the mean of its divisors is an integer number (124951944).

Almost surely, 2^249903887 is an apocalyptic number.

249903887 is a deficient number, since it is larger than the sum of its proper divisors (1).

249903887 is an equidigital number, since it uses as much as digits as its factorization.

249903887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 249903887 is about 15808.3486487362. The cubic root of 249903887 is about 629.8797847384.

The spelling of 249903887 in words is "two hundred forty-nine million, nine hundred three thousand, eight hundred eighty-seven".