2421666 has 48 divisors (see below), whose sum is σ = 5765760. Its totient is φ = 730080.

The previous prime is 2421659. The next prime is 2421673. The reversal of 2421666 is 6661242.

It is a happy number.

2421666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2421659) and next prime (2421673).

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 23 ways as a sum of consecutive naturals, for example, 18421 + ... + 18551.

It is an arithmetic number, because the mean of its divisors is an integer number (120120).

2^2421666 is an apocalyptic number.

2421666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2421666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2882880).

2421666 is an abundant number, since it is smaller than the sum of its proper divisors (3344094).

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

2421666 is a wasteful number, since it uses less digits than its factorization.

2421666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 228 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2421666 is about 1556.1702991639. The cubic root of 2421666 is about 134.2882707698.

The spelling of 2421666 in words is "two million, four hundred twenty-one thousand, six hundred sixty-six".