2178394 has 4 divisors (see below), whose sum is σ = 3267594. Its totient is φ = 1089196.

The previous prime is 2178389. The next prime is 2178409. The reversal of 2178394 is 4938712.

2178394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 2140369 + 38025 = 1463^2 + 195^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544597 + ... + 544600.

2^2178394 is an apocalyptic number.

2178394 is a deficient number, since it is larger than the sum of its proper divisors (1089200).

2178394 is a wasteful number, since it uses less digits than its factorization.

2178394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089199.

The product of its digits is 12096, while the sum is 34.

The square root of 2178394 is about 1475.9383455958. The cubic root of 2178394 is about 129.6319768807.

The spelling of 2178394 in words is "two million, one hundred seventy-eight thousand, three hundred ninety-four".