1668349 has 4 divisors (see below), whose sum is σ = 1672636. Its totient is φ = 1664064.

The previous prime is 1668347. The next prime is 1668361. The reversal of 1668349 is 9438661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1036324 + 632025 = 1018^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668349 - 2¹ = 1668347 is a prime.

It is a Duffinian number.

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, 1494 + ... + 2359.

It is an arithmetic number, because the mean of its divisors is an integer number (418159).

2^1668349 is an apocalyptic number.

It is an amenable number.

1668349 is a deficient number, since it is larger than the sum of its proper divisors (4287).

1668349 is an equidigital number, since it uses as much as digits as its factorization.

1668349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286.

The product of its digits is 31104, while the sum is 37.

The square root of 1668349 is about 1291.6458492946. The cubic root of 1668349 is about 118.6029892691.

It can be divided in two parts, 166 and 8349, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 1668349 in words is "one million, six hundred sixty-eight thousand, three hundred forty-nine".