2012905 has 4 divisors (see below), whose sum is σ = 2415492. Its totient is φ = 1610320.

The previous prime is 2012893. The next prime is 2012909. The reversal of 2012905 is 5092102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5092102 = 2 ⋅2546051.

It can be written as a sum of positive squares in 2 ways, for example, as 1545049 + 467856 = 1243^2 + 684^2 .

It is not a de Polignac number, because 2012905 - 2¹³ = 2004713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2012909) 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, 201286 + ... + 201295.

It is an arithmetic number, because the mean of its divisors is an integer number (603873).

2^2012905 is an apocalyptic number.

It is an amenable number.

2012905 is a deficient number, since it is larger than the sum of its proper divisors (402587).

2012905 is an equidigital number, since it uses as much as digits as its factorization.

2012905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402586.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 2012905 is about 1418.7688324741. The cubic root of 2012905 is about 126.2625122390.

It can be divided in two parts, 201290 and 5, that added together give a triangular number (201295 = T₆₃₄).

The spelling of 2012905 in words is "two million, twelve thousand, nine hundred five".