1666920 has 64 divisors (see below), whose sum is σ = 5184000. Its totient is φ = 428288.

The previous prime is 1666919. The next prime is 1666933. The reversal of 1666920 is 296661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3241 + ... + 3719.

It is an arithmetic number, because the mean of its divisors is an integer number (81000).

2^1666920 is an apocalyptic number.

1666920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2592000).

1666920 is an abundant number, since it is smaller than the sum of its proper divisors (3517080).

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

1666920 is a wasteful number, since it uses less digits than its factorization.

1666920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1666920 is about 1291.0925605858. The cubic root of 1666920 is about 118.5691170429.

The spelling of 1666920 in words is "one million, six hundred sixty-six thousand, nine hundred twenty".