2660905 has 24 divisors (see below), whose sum is σ = 3583872. Its totient is φ = 1894464.

The previous prime is 2660899. The next prime is 2660963. The reversal of 2660905 is 5090662.

It is not a de Polignac number, because 2660905 - 2⁵ = 2660873 is a prime.

It is a Duffinian number.

2660905 is a lucky number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39682 + ... + 39748.

It is an arithmetic number, because the mean of its divisors is an integer number (149328).

2^2660905 is an apocalyptic number.

It is an amenable number.

2660905 is a deficient number, since it is larger than the sum of its proper divisors (922967).

2660905 is a wasteful number, since it uses less digits than its factorization.

2660905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 2660905 is about 1631.2280649866. The cubic root of 2660905 is about 138.5723099408.

Subtracting from 2660905 its product of nonzero digits (3240), we obtain a triangular number (2657665 = T₂₃₀₅).

The spelling of 2660905 in words is "two million, six hundred sixty thousand, nine hundred five".