2666905 has 8 divisors (see below), whose sum is σ = 3232584. Its totient is φ = 2112000.

The previous prime is 2666891. The next prime is 2666929. The reversal of 2666905 is 5096662.

It can be written as a sum of positive squares in 4 ways, for example, as 419904 + 2247001 = 648^2 + 1499^2 .

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

It is not a de Polignac number, because 2666905 - 2⁹ = 2666393 is a prime.

It is a super-2 number, since 2×2666905² = 14224764558050, which contains 22 as substring.

It is a Duffinian number.

2666905 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2136 + ... + 3145.

It is an arithmetic number, because the mean of its divisors is an integer number (404073).

2^2666905 is an apocalyptic number.

It is an amenable number.

2666905 is a deficient number, since it is larger than the sum of its proper divisors (565679).

2666905 is a wasteful number, since it uses less digits than its factorization.

2666905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 2666905 is about 1633.0661346069. The cubic root of 2666905 is about 138.6763860246.

The spelling of 2666905 in words is "two million, six hundred sixty-six thousand, nine hundred five".