249999855 has 16 divisors (see below), whose sum is σ = 457142784. Its totient is φ = 114285600.

The previous prime is 249999851. The next prime is 249999859. The reversal of 249999855 is 558999942.

It is an interprime number because it is at equal distance from previous prime (249999851) and next prime (249999859).

It is not a de Polignac number, because 249999855 - 2² = 249999851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249999851) 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 15 ways as a sum of consecutive naturals, for example, 1190371 + ... + 1190580.

It is an arithmetic number, because the mean of its divisors is an integer number (28571424).

Almost surely, 2^249999855 is an apocalyptic number.

249999855 is a deficient number, since it is larger than the sum of its proper divisors (207142929).

249999855 is a wasteful number, since it uses less digits than its factorization.

249999855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380966.

The product of its digits is 10497600, while the sum is 60.

The square root of 249999855 is about 15811.3837155386. The cubic root of 249999855 is about 629.9604031550.

The spelling of 249999855 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, eight hundred fifty-five".