2166624 has 36 divisors (see below), whose sum is σ = 6162156. Its totient is φ = 722112.

The previous prime is 2166613. The next prime is 2166629. The reversal of 2166624 is 4266612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3474 + ... + 4049.

It is an arithmetic number, because the mean of its divisors is an integer number (171171).

2^2166624 is an apocalyptic number.

2166624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2166624 is an abundant number, since it is smaller than the sum of its proper divisors (3995532).

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

2166624 is a wasteful number, since it uses less digits than its factorization.

2166624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7539 (or 7528 counting only the distinct ones).

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

The square root of 2166624 is about 1471.9456511706. The cubic root of 2166624 is about 129.3980852175.

The spelling of 2166624 in words is "two million, one hundred sixty-six thousand, six hundred twenty-four".