1946939809 has 2 divisors, whose sum is σ = 1946939810. Its totient is φ = 1946939808.

The previous prime is 1946939759. The next prime is 1946939837. The reversal of 1946939809 is 9089396491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1931163025 + 15776784 = 43945^2 + 3972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1946939809 - 2¹¹ = 1946937761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1946939849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973469904 + 973469905.

It is an arithmetic number, because the mean of its divisors is an integer number (973469905).

Almost surely, 2^1946939809 is an apocalyptic number.

It is an amenable number.

1946939809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1946939809 is an equidigital number, since it uses as much as digits as its factorization.

1946939809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 58.

The square root of 1946939809 is about 44124.1408868207. The cubic root of 1946939809 is about 1248.6790972511.

The spelling of 1946939809 in words is "one billion, nine hundred forty-six million, nine hundred thirty-nine thousand, eight hundred nine".