1684467949 has 2 divisors, whose sum is σ = 1684467950. Its totient is φ = 1684467948.

The previous prime is 1684467947. The next prime is 1684467991. The reversal of 1684467949 is 9497644861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1571726025 + 112741924 = 39645^2 + 10618^2 .

It is a cyclic number.

It is not a de Polignac number, because 1684467949 - 2¹ = 1684467947 is a prime.

Together with 1684467947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1684467893 and 1684467902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684467947) by changing a digit.

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 as a sum of consecutive naturals, namely, 842233974 + 842233975.

It is an arithmetic number, because the mean of its divisors is an integer number (842233975).

Almost surely, 2^1684467949 is an apocalyptic number.

It is an amenable number.

1684467949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684467949 is an equidigital number, since it uses as much as digits as its factorization.

1684467949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 58.

The square root of 1684467949 is about 41042.2702710267. The cubic root of 1684467949 is about 1189.8373124582.

The spelling of 1684467949 in words is "one billion, six hundred eighty-four million, four hundred sixty-seven thousand, nine hundred forty-nine".