249996857 has 8 divisors (see below), whose sum is σ = 272885760. Its totient is φ = 227134960.

The previous prime is 249996853. The next prime is 249996869. The reversal of 249996857 is 758699942.

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

It is a cyclic number.

It is not a de Polignac number, because 249996857 - 2² = 249996853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249996796 and 249996805.

It is not an unprimeable number, because it can be changed into a prime (249996853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15944 + ... + 27462.

It is an arithmetic number, because the mean of its divisors is an integer number (34110720).

Almost surely, 2^249996857 is an apocalyptic number.

It is an amenable number.

249996857 is a deficient number, since it is larger than the sum of its proper divisors (22888903).

249996857 is a wasteful number, since it uses less digits than its factorization.

249996857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13503.

The product of its digits is 9797760, while the sum is 59.

The square root of 249996857 is about 15811.2889101427. The cubic root of 249996857 is about 629.9578849818.

The spelling of 249996857 in words is "two hundred forty-nine million, nine hundred ninety-six thousand, eight hundred fifty-seven".