2178434 has 4 divisors (see below), whose sum is σ = 3267654. Its totient is φ = 1089216.

The previous prime is 2178433. The next prime is 2178439. The reversal of 2178434 is 4348712.

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., 2175625 + 2809 = 1475^2 + 53^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2178397 and 2178406.

It is not an unprimeable number, because it can be changed into a prime (2178433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544607 + ... + 544610.

2^2178434 is an apocalyptic number.

2178434 is a deficient number, since it is larger than the sum of its proper divisors (1089220).

2178434 is a wasteful number, since it uses less digits than its factorization.

2178434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089219.

The product of its digits is 5376, while the sum is 29.

The square root of 2178434 is about 1475.9518962351. The cubic root of 2178434 is about 129.6327703164.

The spelling of 2178434 in words is "two million, one hundred seventy-eight thousand, four hundred thirty-four".