2172706 has 4 divisors (see below), whose sum is σ = 3259062. Its totient is φ = 1086352.

The previous prime is 2172701. The next prime is 2172721. The reversal of 2172706 is 6072712.

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., 2088025 + 84681 = 1445^2 + 291^2 .

It is not an unprimeable number, because it can be changed into a prime (2172701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543175 + ... + 543178.

2^2172706 is an apocalyptic number.

2172706 is a deficient number, since it is larger than the sum of its proper divisors (1086356).

2172706 is a wasteful number, since it uses less digits than its factorization.

2172706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086355.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 2172706 is about 1474.0101763556. The cubic root of 2172706 is about 129.5190512761.

It can be divided in two parts, 21 and 72706, that added together give a palindrome (72727).

The spelling of 2172706 in words is "two million, one hundred seventy-two thousand, seven hundred six".