2181974 has 8 divisors (see below), whose sum is σ = 3279360. Its totient is φ = 1088856.

The previous prime is 2181973. The next prime is 2182007. The reversal of 2181974 is 4791812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2181974² = 9522021073352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2181974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067 + ... + 2345.

It is an arithmetic number, because the mean of its divisors is an integer number (409920).

2^2181974 is an apocalyptic number.

2181974 is a deficient number, since it is larger than the sum of its proper divisors (1097386).

2181974 is a wasteful number, since it uses less digits than its factorization.

2181974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134.

The product of its digits is 4032, while the sum is 32.

The square root of 2181974 is about 1477.1506355142. The cubic root of 2181974 is about 129.7029509534.

The spelling of 2181974 in words is "two million, one hundred eighty-one thousand, nine hundred seventy-four".