1678812 has 12 divisors (see below), whose sum is σ = 3917256. Its totient is φ = 559600.

The previous prime is 1678777. The next prime is 1678837. The reversal of 1678812 is 2188761.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 69939 + ... + 69962.

It is an arithmetic number, because the mean of its divisors is an integer number (326438).

2^1678812 is an apocalyptic number.

1678812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1678812 is an abundant number, since it is smaller than the sum of its proper divisors (2238444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1678812 is a wasteful number, since it uses less digits than its factorization.

1678812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139908 (or 139906 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 1678812 is about 1295.6897776860. The cubic root of 1678812 is about 118.8504111013.

The spelling of 1678812 in words is "one million, six hundred seventy-eight thousand, eight hundred twelve".