2178994 has 4 divisors (see below), whose sum is σ = 3268494. Its totient is φ = 1089496.

The previous prime is 2178991. The next prime is 2179007. The reversal of 2178994 is 4998712.

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., 1890625 + 288369 = 1375^2 + 537^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2178991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544747 + ... + 544750.

2^2178994 is an apocalyptic number.

2178994 is a deficient number, since it is larger than the sum of its proper divisors (1089500).

2178994 is a wasteful number, since it uses less digits than its factorization.

2178994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089499.

The product of its digits is 36288, while the sum is 40.

The square root of 2178994 is about 1476.1415921245. The cubic root of 2178994 is about 129.6438773979.

The spelling of 2178994 in words is "two million, one hundred seventy-eight thousand, nine hundred ninety-four".