1678344193 has 4 divisors (see below), whose sum is σ = 1777070340. Its totient is φ = 1579618048.

The previous prime is 1678344191. The next prime is 1678344209. The reversal of 1678344193 is 3914438761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3914438761 = 773 ⋅5063957.

It can be written as a sum of positive squares in 2 ways, for example, as 1567526464 + 110817729 = 39592^2 + 10527^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678344193 - 2¹ = 1678344191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678344191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49363048 + ... + 49363081.

It is an arithmetic number, because the mean of its divisors is an integer number (444267585).

Almost surely, 2^1678344193 is an apocalyptic number.

It is an amenable number.

1678344193 is a deficient number, since it is larger than the sum of its proper divisors (98726147).

1678344193 is an equidigital number, since it uses as much as digits as its factorization.

1678344193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98726146.

The product of its digits is 435456, while the sum is 46.

The square root of 1678344193 is about 40967.5993072574. The cubic root of 1678344193 is about 1188.3937071095.

The spelling of 1678344193 in words is "one billion, six hundred seventy-eight million, three hundred forty-four thousand, one hundred ninety-three".