1678079405 has 4 divisors (see below), whose sum is σ = 2013695292. Its totient is φ = 1342463520.

The previous prime is 1678079371. The next prime is 1678079419. The reversal of 1678079405 is 5049708761.

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 501177769 + 1176901636 = 22387^2 + 34306^2 .

It is not a de Polignac number, because 1678079405 - 2⁶ = 1678079341 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1678079405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167807936 + ... + 167807945.

It is an arithmetic number, because the mean of its divisors is an integer number (503423823).

Almost surely, 2^1678079405 is an apocalyptic number.

It is an amenable number.

1678079405 is a deficient number, since it is larger than the sum of its proper divisors (335615887).

1678079405 is an equidigital number, since it uses as much as digits as its factorization.

1678079405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335615886.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 1678079405 is about 40964.3675039662. The cubic root of 1678079405 is about 1188.3312072273.

The spelling of 1678079405 in words is "one billion, six hundred seventy-eight million, seventy-nine thousand, four hundred five".