2181376 has 18 divisors (see below), whose sum is σ = 4354742. Its totient is φ = 1090560.

The previous prime is 2181373. The next prime is 2181379. The reversal of 2181376 is 6731812.

It is an interprime number because it is at equal distance from previous prime (2181373) and next prime (2181379).

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 331776 = 1360^2 + 576^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4005 + ... + 4516.

2^2181376 is an apocalyptic number.

It is an amenable number.

2181376 is a deficient number, since it is larger than the sum of its proper divisors (2173366).

2181376 is an frugal number, since it uses more digits than its factorization.

2181376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8537 (or 8523 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 2181376 is about 1476.9482049144. The cubic root of 2181376 is about 129.6911009113.

The spelling of 2181376 in words is "two million, one hundred eighty-one thousand, three hundred seventy-six".