1669668 has 96 divisors (see below), whose sum is σ = 5268480. Its totient is φ = 397440.

The previous prime is 1669651. The next prime is 1669687. The reversal of 1669668 is 8669661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11943 + ... + 12081.

It is an arithmetic number, because the mean of its divisors is an integer number (54880).

2^1669668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2634240).

1669668 is an abundant number, since it is smaller than the sum of its proper divisors (3598812).

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

1669668 is a wasteful number, since it uses less digits than its factorization.

1669668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 175 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 1669668 is about 1292.1563372905. The cubic root of 1669668 is about 118.6342369546.

The spelling of 1669668 in words is "one million, six hundred sixty-nine thousand, six hundred sixty-eight".