1686412 has 48 divisors (see below), whose sum is σ = 3753792. Its totient is φ = 645120.

The previous prime is 1686409. The next prime is 1686439. The reversal of 1686412 is 2146861.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14868 + ... + 14980.

It is an arithmetic number, because the mean of its divisors is an integer number (78204).

2^1686412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1876896).

1686412 is an abundant number, since it is smaller than the sum of its proper divisors (2067380).

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

1686412 is a wasteful number, since it uses less digits than its factorization.

1686412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 176 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 1686412 is about 1298.6192667599. The cubic root of 1686412 is about 119.0294868435.

The spelling of 1686412 in words is "one million, six hundred eighty-six thousand, four hundred twelve".