1946809 has 2 divisors, whose sum is σ = 1946810. Its totient is φ = 1946808.

The previous prime is 1946801. The next prime is 1946839. The reversal of 1946809 is 9086491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1946025 + 784 = 1395^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 1946809 - 2³ = 1946801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1946801) 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, 973404 + 973405.

It is an arithmetic number, because the mean of its divisors is an integer number (973405).

2^1946809 is an apocalyptic number.

It is an amenable number.

1946809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1946809 is an equidigital number, since it uses as much as digits as its factorization.

1946809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1946809 is about 1395.2809752878. The cubic root of 1946809 is about 124.8651131634.

The spelling of 1946809 in words is "one million, nine hundred forty-six thousand, eight hundred nine".