1678840 has 48 divisors (see below), whose sum is σ = 4062600. Its totient is φ = 622656.

The previous prime is 1678837. The next prime is 1678843. The reversal of 1678840 is 488761.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1678837) and next prime (1678843).

It is a junction number, because it is equal to n+sod(n) for n = 1678796 and 1678805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678843) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 35697 + ... + 35743.

2^1678840 is an apocalyptic number.

1678840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2031300).

1678840 is an abundant number, since it is smaller than the sum of its proper divisors (2383760).

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

1678840 is a wasteful number, since it uses less digits than its factorization.

1678840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1678840 is about 1295.7005826965. The cubic root of 1678840 is about 118.8510718449.

The spelling of 1678840 in words is "one million, six hundred seventy-eight thousand, eight hundred forty".