1678940 has 24 divisors (see below), whose sum is σ = 3558912. Its totient is φ = 665280.

The previous prime is 1678921. The next prime is 1678951. The reversal of 1678940 is 498761.

It is a self number, because there is not a number n which added to its sum of digits gives 1678940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2210 + ... + 2870.

It is an arithmetic number, because the mean of its divisors is an integer number (148288).

2^1678940 is an apocalyptic number.

1678940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1678940 is an abundant number, since it is smaller than the sum of its proper divisors (1879972).

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

1678940 is a wasteful number, since it uses less digits than its factorization.

1678940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1678940 is about 1295.7391712841. The cubic root of 1678940 is about 118.8534315836.

The spelling of 1678940 in words is "one million, six hundred seventy-eight thousand, nine hundred forty".