1668340 has 12 divisors (see below), whose sum is σ = 3503556. Its totient is φ = 667328.

The previous prime is 1668323. The next prime is 1668347. The reversal of 1668340 is 438661.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 1350244 = 564^2 + 1162^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1668299 and 1668308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668347) 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, 41689 + ... + 41728.

It is an arithmetic number, because the mean of its divisors is an integer number (291963).

2^1668340 is an apocalyptic number.

1668340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668340 is an abundant number, since it is smaller than the sum of its proper divisors (1835216).

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

1668340 is a wasteful number, since it uses less digits than its factorization.

1668340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83426 (or 83424 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1668340 is about 1291.6423653628. The cubic root of 1668340 is about 118.6027759987.

The spelling of 1668340 in words is "one million, six hundred sixty-eight thousand, three hundred forty".