2181368 has 16 divisors (see below), whose sum is σ = 4674480. Its totient is φ = 934848.

The previous prime is 2181359. The next prime is 2181373. The reversal of 2181368 is 8631812.

It is a self number, because there is not a number n which added to its sum of digits gives 2181368.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19421 + ... + 19532.

It is an arithmetic number, because the mean of its divisors is an integer number (292155).

2^2181368 is an apocalyptic number.

2181368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2181368 is an abundant number, since it is smaller than the sum of its proper divisors (2493112).

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

2181368 is a wasteful number, since it uses less digits than its factorization.

2181368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38966 (or 38962 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 2181368 is about 1476.9454966247. The cubic root of 2181368 is about 129.6909423676.

The spelling of 2181368 in words is "two million, one hundred eighty-one thousand, three hundred sixty-eight".