2906305 has 4 divisors (see below), whose sum is σ = 3487572. Its totient is φ = 2325040.

The previous prime is 2906291. The next prime is 2906333. The reversal of 2906305 is 5036092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1971216 + 935089 = 1404^2 + 967^2 .

It is not a de Polignac number, because 2906305 - 2¹¹ = 2904257 is a prime.

It is a Duffinian number.

2906305 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2906305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290626 + ... + 290635.

It is an arithmetic number, because the mean of its divisors is an integer number (871893).

2^2906305 is an apocalyptic number.

It is an amenable number.

2906305 is a deficient number, since it is larger than the sum of its proper divisors (581267).

2906305 is an equidigital number, since it uses as much as digits as its factorization.

2906305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581266.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 2906305 is about 1704.7888432296. The cubic root of 2906305 is about 142.7075870575.

The spelling of 2906305 in words is "two million, nine hundred six thousand, three hundred five".