2120906 has 4 divisors (see below), whose sum is σ = 3181362. Its totient is φ = 1060452.

The previous prime is 2120891. The next prime is 2120917. The reversal of 2120906 is 6090212.

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., 1301881 + 819025 = 1141^2 + 905^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530225 + ... + 530228.

2^2120906 is an apocalyptic number.

2120906 is a deficient number, since it is larger than the sum of its proper divisors (1060456).

2120906 is a wasteful number, since it uses less digits than its factorization.

2120906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060455.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2120906 is about 1456.3330663004. Note that the first 3 decimals coincide. The cubic root of 2120906 is about 128.4814631065.

The spelling of 2120906 in words is "two million, one hundred twenty thousand, nine hundred six".