1678869 has 12 divisors (see below), whose sum is σ = 2567916. Its totient is φ = 1053312.

The previous prime is 1678861. The next prime is 1678871. The reversal of 1678869 is 9688761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1134225 + 544644 = 1065^2 + 738^2 .

It is not a de Polignac number, because 1678869 - 2³ = 1678861 is a prime.

It is a super-2 number, since 2×1678869² = 5637202238322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5334 + ... + 5639.

It is an arithmetic number, because the mean of its divisors is an integer number (213993).

2^1678869 is an apocalyptic number.

It is an amenable number.

1678869 is a deficient number, since it is larger than the sum of its proper divisors (889047).

1678869 is a wasteful number, since it uses less digits than its factorization.

1678869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10996 (or 10993 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1678869 is about 1295.7117735052. The cubic root of 1678869 is about 118.8517561788.

The spelling of 1678869 in words is "one million, six hundred seventy-eight thousand, eight hundred sixty-nine".