2172836 has 12 divisors (see below), whose sum is σ = 3895500. Its totient is φ = 1059840.

The previous prime is 2172829. The next prime is 2172839. The reversal of 2172836 is 6382712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 295936 + 1876900 = 544^2 + 1370^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2172799 and 2172808.

It is not an unprimeable number, because it can be changed into a prime (2172839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6461 + ... + 6788.

It is an arithmetic number, because the mean of its divisors is an integer number (324625).

2^2172836 is an apocalyptic number.

It is an amenable number.

2172836 is a deficient number, since it is larger than the sum of its proper divisors (1722664).

2172836 is a wasteful number, since it uses less digits than its factorization.

2172836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13294 (or 13292 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 2172836 is about 1474.0542730849. The cubic root of 2172836 is about 129.5216344052.

The spelling of 2172836 in words is "two million, one hundred seventy-two thousand, eight hundred thirty-six".