2181375 has 48 divisors (see below), whose sum is σ = 4510272. Its totient is φ = 993600.

The previous prime is 2181373. The next prime is 2181379. The reversal of 2181375 is 5731812.

It is not a de Polignac number, because 2181375 - 2¹ = 2181373 is a prime.

2181375 is a lucky number.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7737 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (93964).

2^2181375 is an apocalyptic number.

2181375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2181375 is an abundant number, since it is smaller than the sum of its proper divisors (2328897).

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

2181375 is a wasteful number, since it uses less digits than its factorization.

2181375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 292 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2181375 is about 1476.9478663785. The cubic root of 2181375 is about 129.6910810934.

It can be divided in two parts, 2181 and 375, that added together give a triangular number (2556 = T₇₁).

The spelling of 2181375 in words is "two million, one hundred eighty-one thousand, three hundred seventy-five".