1678045 has 4 divisors (see below), whose sum is σ = 2013660. Its totient is φ = 1342432.

The previous prime is 1678037. The next prime is 1678067. The reversal of 1678045 is 5408761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1004004 + 674041 = 1002^2 + 821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678045 - 2³ = 1678037 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 16.

It is a nialpdrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 1677998 and 1678016.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 167800 + ... + 167809.

It is an arithmetic number, because the mean of its divisors is an integer number (503415).

2^1678045 is an apocalyptic number.

It is an amenable number.

1678045 is a deficient number, since it is larger than the sum of its proper divisors (335615).

1678045 is an equidigital number, since it uses as much as digits as its factorization.

1678045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335614.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1678045 is about 1295.3937625294. The cubic root of 1678045 is about 118.8323085877.

The spelling of 1678045 in words is "one million, six hundred seventy-eight thousand, forty-five".