1678220 has 12 divisors (see below), whose sum is σ = 3524304. Its totient is φ = 671280.

The previous prime is 1678219. The next prime is 1678231. The reversal of 1678220 is 228761.

It is a self number, because there is not a number n which added to its sum of digits gives 1678220.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 41936 + ... + 41975.

It is an arithmetic number, because the mean of its divisors is an integer number (293692).

2^1678220 is an apocalyptic number.

1678220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1678220 is an abundant number, since it is smaller than the sum of its proper divisors (1846084).

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

1678220 is a wasteful number, since it uses less digits than its factorization.

1678220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83920 (or 83918 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1678220 is about 1295.4613077973. The cubic root of 1678220 is about 118.8364393730.

The spelling of 1678220 in words is "one million, six hundred seventy-eight thousand, two hundred twenty".