1678312 has 8 divisors (see below), whose sum is σ = 3146850. Its totient is φ = 839152.

The previous prime is 1678301. The next prime is 1678319. The reversal of 1678312 is 2138761.

It can be written as a sum of positive squares in only one way, i.e., 857476 + 820836 = 926^2 + 906^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1678319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104887 + ... + 104902.

2^1678312 is an apocalyptic number.

It is an amenable number.

1678312 is a deficient number, since it is larger than the sum of its proper divisors (1468538).

1678312 is a wasteful number, since it uses less digits than its factorization.

1678312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209795 (or 209791 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 1678312 is about 1295.4968158973. The cubic root of 1678312 is about 118.8386108707.

The spelling of 1678312 in words is "one million, six hundred seventy-eight thousand, three hundred twelve".