3120905 has 8 divisors (see below), whose sum is σ = 3816072. Its totient is φ = 2449408.

The previous prime is 3120899. The next prime is 3120907. The reversal of 3120905 is 5090213.

It can be written as a sum of positive squares in 4 ways, for example, as 822649 + 2298256 = 907^2 + 1516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3120905 - 2⁴ = 3120889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3120907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5624 + ... + 6153.

It is an arithmetic number, because the mean of its divisors is an integer number (477009).

Almost surely, 2^3120905 is an apocalyptic number.

It is an amenable number.

3120905 is a deficient number, since it is larger than the sum of its proper divisors (695167).

3120905 is a wasteful number, since it uses less digits than its factorization.

3120905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11835.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 3120905 is about 1766.6083323703. The cubic root of 3120905 is about 146.1369984486.

The spelling of 3120905 in words is "three million, one hundred twenty thousand, nine hundred five".