1668630 has 16 divisors (see below), whose sum is σ = 4004784. Its totient is φ = 444960.

The previous prime is 1668629. The next prime is 1668647. The reversal of 1668630 is 368661.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 55621 = 1668630 / (1 + 6 + 6 + 8 + 6 + 3 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27781 + ... + 27840.

It is an arithmetic number, because the mean of its divisors is an integer number (250299).

2^1668630 is an apocalyptic number.

1668630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668630 is an abundant number, since it is smaller than the sum of its proper divisors (2336154).

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

1668630 is a wasteful number, since it uses less digits than its factorization.

1668630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55631.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1668630 is about 1291.7546206614. The cubic root of 1668630 is about 118.6096476620.

The spelling of 1668630 in words is "one million, six hundred sixty-eight thousand, six hundred thirty".