1668447 has 24 divisors (see below), whose sum is σ = 2770560. Its totient is φ = 956880.

The previous prime is 1668437. The next prime is 1668449. The reversal of 1668447 is 7448661.

It is not a de Polignac number, because 1668447 - 2⁷ = 1668319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1438 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (115440).

2^1668447 is an apocalyptic number.

1668447 is a deficient number, since it is larger than the sum of its proper divisors (1102113).

1668447 is a wasteful number, since it uses less digits than its factorization.

1668447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 920 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1668447 is about 1291.6837848328. The cubic root of 1668447 is about 118.6053114982.

The spelling of 1668447 in words is "one million, six hundred sixty-eight thousand, four hundred forty-seven".