2178941 has 4 divisors (see below), whose sum is σ = 2307132. Its totient is φ = 2050752.

The previous prime is 2178937. The next prime is 2178947. The reversal of 2178941 is 1498712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2042041 + 136900 = 1429^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178941 - 2² = 2178937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2178898 and 2178907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178947) 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, 64070 + ... + 64103.

It is an arithmetic number, because the mean of its divisors is an integer number (576783).

2^2178941 is an apocalyptic number.

It is an amenable number.

2178941 is a deficient number, since it is larger than the sum of its proper divisors (128191).

2178941 is a wasteful number, since it uses less digits than its factorization.

2178941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128190.

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

The square root of 2178941 is about 1476.1236398080. The cubic root of 2178941 is about 129.6428262735.

The spelling of 2178941 in words is "two million, one hundred seventy-eight thousand, nine hundred forty-one".