1668618 has 96 divisors (see below), whose sum is σ = 4717440. Its totient is φ = 414720.

The previous prime is 1668617. The next prime is 1668619. The reversal of 1668618 is 8168661.

It is an interprime number because it is at equal distance from previous prime (1668617) and next prime (1668619).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1668617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40678 + ... + 40718.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1668618 is an apocalyptic number.

1668618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2358720).

1668618 is an abundant number, since it is smaller than the sum of its proper divisors (3048822).

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

1668618 is a wasteful number, since it uses less digits than its factorization.

1668618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 89 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1668618 is about 1291.7499758080. The cubic root of 1668618 is about 118.6093633331.

The spelling of 1668618 in words is "one million, six hundred sixty-eight thousand, six hundred eighteen".