1678420 has 12 divisors (see below), whose sum is σ = 3524724. Its totient is φ = 671360.

The previous prime is 1678409. The next prime is 1678421. The reversal of 1678420 is 248761.

It can be written as a sum of positive squares in 2 ways, for example, as 1245456 + 432964 = 1116^2 + 658^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41941 + ... + 41980.

It is an arithmetic number, because the mean of its divisors is an integer number (293727).

2^1678420 is an apocalyptic number.

1678420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1678420 is an abundant number, since it is smaller than the sum of its proper divisors (1846304).

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

1678420 is a wasteful number, since it uses less digits than its factorization.

1678420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83930 (or 83928 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1678420 is about 1295.5384980772. The cubic root of 1678420 is about 118.8411599189.

The spelling of 1678420 in words is "one million, six hundred seventy-eight thousand, four hundred twenty".