1668973 has 4 divisors (see below), whose sum is σ = 1681120. Its totient is φ = 1656828.

The previous prime is 1668971. The next prime is 1668983. The reversal of 1668973 is 3798661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3798661 = 83 ⋅45767.

It is a cyclic number.

It is not a de Polignac number, because 1668973 - 2¹ = 1668971 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 (1668971) 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, 5865 + ... + 6142.

It is an arithmetic number, because the mean of its divisors is an integer number (420280).

2^1668973 is an apocalyptic number.

It is an amenable number.

1668973 is a deficient number, since it is larger than the sum of its proper divisors (12147).

1668973 is a wasteful number, since it uses less digits than its factorization.

1668973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12146.

The product of its digits is 54432, while the sum is 40.

The square root of 1668973 is about 1291.8873789925. The cubic root of 1668973 is about 118.6177741533.

The spelling of 1668973 in words is "one million, six hundred sixty-eight thousand, nine hundred seventy-three".