2130905 has 16 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 1444992.

The previous prime is 2130901. The next prime is 2130911. The reversal of 2130905 is 5090312.

It is a cyclic number.

It is not a de Polignac number, because 2130905 - 2² = 2130901 is a prime.

It is a super-2 number, since 2×2130905² = 9081512238050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2130901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3461 + ... + 4029.

It is an arithmetic number, because the mean of its divisors is an integer number (184680).

2^2130905 is an apocalyptic number.

It is an amenable number.

2130905 is a deficient number, since it is larger than the sum of its proper divisors (823975).

2130905 is a wasteful number, since it uses less digits than its factorization.

2130905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

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

The square root of 2130905 is about 1459.7619668973. The cubic root of 2130905 is about 128.6830550267.

The spelling of 2130905 in words is "two million, one hundred thirty thousand, nine hundred five".