827997949 has 2 divisors, whose sum is σ = 827997950. Its totient is φ = 827997948.

The previous prime is 827997943. The next prime is 827997967. The reversal of 827997949 is 949799728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 575760025 + 252237924 = 23995^2 + 15882^2 .

It is a cyclic number.

It is not a de Polignac number, because 827997949 - 2⁹ = 827997437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827997943) 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 as a sum of consecutive naturals, namely, 413998974 + 413998975.

It is an arithmetic number, because the mean of its divisors is an integer number (413998975).

Almost surely, 2^827997949 is an apocalyptic number.

It is an amenable number.

827997949 is a deficient number, since it is larger than the sum of its proper divisors (1).

827997949 is an equidigital number, since it uses as much as digits as its factorization.

827997949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20575296, while the sum is 64.

The square root of 827997949 is about 28774.9535012656. The cubic root of 827997949 is about 939.0234119621.

The spelling of 827997949 in words is "eight hundred twenty-seven million, nine hundred ninety-seven thousand, nine hundred forty-nine".