2181374 has 16 divisors (see below), whose sum is σ = 3592512. Its totient is φ = 987168.

The previous prime is 2181373. The next prime is 2181379. The reversal of 2181374 is 4731812.

2181374 = T₂₆₀ + T₂₆₁ + ... + T₃₁₂.

2181374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587 + ... + 2169.

It is an arithmetic number, because the mean of its divisors is an integer number (224532).

2^2181374 is an apocalyptic number.

2181374 is a deficient number, since it is larger than the sum of its proper divisors (1411138).

2181374 is a wasteful number, since it uses less digits than its factorization.

2181374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651.

The product of its digits is 1344, while the sum is 26.

The square root of 2181374 is about 1476.9475278425. The cubic root of 2181374 is about 129.6910612754.

The spelling of 2181374 in words is "two million, one hundred eighty-one thousand, three hundred seventy-four".