1683949 has 2 divisors, whose sum is σ = 1683950. Its totient is φ = 1683948.

The previous prime is 1683887. The next prime is 1683971. The reversal of 1683949 is 9493861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1671849 + 12100 = 1293^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1683949 - 2¹⁹ = 1159661 is a prime.

1683949 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1683049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 841974 + 841975.

It is an arithmetic number, because the mean of its divisors is an integer number (841975).

2^1683949 is an apocalyptic number.

It is an amenable number.

1683949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1683949 is an equidigital number, since it uses as much as digits as its factorization.

1683949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 1683949 is about 1297.6706053541. The cubic root of 1683949 is about 118.9715111992.

The spelling of 1683949 in words is "one million, six hundred eighty-three thousand, nine hundred forty-nine".