1946909 has 2 divisors, whose sum is σ = 1946910. Its totient is φ = 1946908.

The previous prime is 1946899. The next prime is 1946921. The reversal of 1946909 is 9096491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1006009 + 940900 = 1003^2 + 970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1946909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1946939) 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, 973454 + 973455.

It is an arithmetic number, because the mean of its divisors is an integer number (973455).

2^1946909 is an apocalyptic number.

It is an amenable number.

1946909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1946909 is an equidigital number, since it uses as much as digits as its factorization.

1946909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 1946909 is about 1395.3168099038. The cubic root of 1946909 is about 124.8672510717.

The spelling of 1946909 in words is "one million, nine hundred forty-six thousand, nine hundred nine".