2180918 has 4 divisors (see below), whose sum is σ = 3271380. Its totient is φ = 1090458.

The previous prime is 2180911. The next prime is 2180921. The reversal of 2180918 is 8190812.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545228 + ... + 545231.

It is an arithmetic number, because the mean of its divisors is an integer number (817845).

2^2180918 is an apocalyptic number.

2180918 is a deficient number, since it is larger than the sum of its proper divisors (1090462).

2180918 is a wasteful number, since it uses less digits than its factorization.

2180918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090461.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 2180918 is about 1476.7931473297. The cubic root of 2180918 is about 129.6820236619.

The spelling of 2180918 in words is "two million, one hundred eighty thousand, nine hundred eighteen".