1668707 has 4 divisors (see below), whose sum is σ = 1691640. Its totient is φ = 1645776.

The previous prime is 1668683. The next prime is 1668721. The reversal of 1668707 is 7078661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7078661 = 193 ⋅36677.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668727) 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, 11357 + ... + 11502.

It is an arithmetic number, because the mean of its divisors is an integer number (422910).

2^1668707 is an apocalyptic number.

1668707 is a deficient number, since it is larger than the sum of its proper divisors (22933).

1668707 is an equidigital number, since it uses as much as digits as its factorization.

1668707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22932.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1668707 is about 1291.7844247397. The cubic root of 1668707 is about 118.6114720733.

The spelling of 1668707 in words is "one million, six hundred sixty-eight thousand, seven hundred seven".