1668920 has 32 divisors (see below), whose sum is σ = 4097520. Its totient is φ = 606720.

The previous prime is 1668913. The next prime is 1668929. The reversal of 1668920 is 298661.

1668920 = T₄₀ + T₄₁ + ... + T₂₁₅.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457 + ... + 2336.

2^1668920 is an apocalyptic number.

1668920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668920 is an abundant number, since it is smaller than the sum of its proper divisors (2428600).

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

1668920 is a wasteful number, since it uses less digits than its factorization.

1668920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815 (or 3811 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1668920 is about 1291.8668662056. The cubic root of 1668920 is about 118.6165185292.

The spelling of 1668920 in words is "one million, six hundred sixty-eight thousand, nine hundred twenty".