9949831857 has 24 divisors (see below), whose sum is σ = 17147104800. Its totient is φ = 5685617448.

The previous prime is 9949831841. The next prime is 9949831909. The reversal of 9949831857 is 7581389499.

9949831857 is a `hidden beast` number, since 99 + 498 + 3 + 1 + 8 + 57 = 666.

It is not a de Polignac number, because 9949831857 - 2⁴ = 9949831841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 9949831794 and 9949831803.

It is not an unprimeable number, because it can be changed into a prime (9949831657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3759007 + ... + 3761652.

It is an arithmetic number, because the mean of its divisors is an integer number (714462700).

Almost surely, 2^9949831857 is an apocalyptic number.

It is an amenable number.

9949831857 is a deficient number, since it is larger than the sum of its proper divisors (7197272943).

9949831857 is a wasteful number, since it uses less digits than its factorization.

9949831857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7520682 (or 7520669 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The square root of 9949831857 is about 99748.8438880371. The cubic root of 9949831857 is about 2150.8258487376.

The spelling of 9949831857 in words is "nine billion, nine hundred forty-nine million, eight hundred thirty-one thousand, eight hundred fifty-seven".