2178145 has 8 divisors (see below), whose sum is σ = 2623104. Its totient is φ = 1736304.

The previous prime is 2178139. The next prime is 2178149. The reversal of 2178145 is 5418712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2178145 is a prime.

It is a Duffinian number.

2178145 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2178149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242 + ... + 2428.

It is an arithmetic number, because the mean of its divisors is an integer number (327888).

2^2178145 is an apocalyptic number.

It is an amenable number.

2178145 is a deficient number, since it is larger than the sum of its proper divisors (444959).

2178145 is a wasteful number, since it uses less digits than its factorization.

2178145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559.

The product of its digits is 2240, while the sum is 28.

The square root of 2178145 is about 1475.8539900681. The cubic root of 2178145 is about 129.6270375244.

The spelling of 2178145 in words is "two million, one hundred seventy-eight thousand, one hundred forty-five".