1394440809 has 8 divisors (see below), whose sum is σ = 1859813760. Its totient is φ = 929347536.

The previous prime is 1394440807. The next prime is 1394440811. The reversal of 1394440809 is 9080444931.

It is an interprime number because it is at equal distance from previous prime (1394440807) and next prime (1394440811).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1394440809 - 2¹ = 1394440807 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1394440807) 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 in 7 ways as a sum of consecutive naturals, for example, 57994 + ... + 78435.

It is an arithmetic number, because the mean of its divisors is an integer number (232476720).

Almost surely, 2^1394440809 is an apocalyptic number.

It is an amenable number.

1394440809 is a deficient number, since it is larger than the sum of its proper divisors (465372951).

1394440809 is a wasteful number, since it uses less digits than its factorization.

1394440809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139839.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1394440809 is about 37342.2121599672. The cubic root of 1394440809 is about 1117.2062622512.

The spelling of 1394440809 in words is "one billion, three hundred ninety-four million, four hundred forty thousand, eight hundred nine".