2106178 has 4 divisors (see below), whose sum is σ = 3159270. Its totient is φ = 1053088.

The previous prime is 2106173. The next prime is 2106191. The reversal of 2106178 is 8716012.

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., 2064969 + 41209 = 1437^2 + 203^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2106173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 526543 + ... + 526546.

2^2106178 is an apocalyptic number.

2106178 is a deficient number, since it is larger than the sum of its proper divisors (1053092).

2106178 is a wasteful number, since it uses less digits than its factorization.

2106178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053091.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 2106178 is about 1451.2677216834. The cubic root of 2106178 is about 128.1833716182.

The spelling of 2106178 in words is "two million, one hundred six thousand, one hundred seventy-eight".