2180042 has 4 divisors (see below), whose sum is σ = 3270066. Its totient is φ = 1090020.

The previous prime is 2180039. The next prime is 2180051. The reversal of 2180042 is 2400812.

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

It can be written as a sum of positive squares in only one way, i.e., 2019241 + 160801 = 1421^2 + 401^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2180042.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545009 + ... + 545012.

2^2180042 is an apocalyptic number.

2180042 is a deficient number, since it is larger than the sum of its proper divisors (1090024).

2180042 is a wasteful number, since it uses less digits than its factorization.

2180042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090023.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2180042 is about 1476.4965289495. The cubic root of 2180042 is about 129.6646583955.

Adding to 2180042 its reverse (2400812), we get a palindrome (4580854).

The spelling of 2180042 in words is "two million, one hundred eighty thousand, forty-two".