249999965 has 8 divisors (see below), whose sum is σ = 309677568. Its totient is φ = 193548240.

The previous prime is 249999941. The next prime is 249999991. The reversal of 249999965 is 569999942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-249999965 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 249999898 and 249999907.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 806297 + ... + 806606.

It is an arithmetic number, because the mean of its divisors is an integer number (38709696).

Almost surely, 2^249999965 is an apocalyptic number.

It is an amenable number.

249999965 is a deficient number, since it is larger than the sum of its proper divisors (59677603).

249999965 is a wasteful number, since it uses less digits than its factorization.

249999965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612939.

The product of its digits is 14171760, while the sum is 62.

The square root of 249999965 is about 15811.3871940447. The cubic root of 249999965 is about 629.9604955493.

The spelling of 249999965 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred sixty-five".