2661805 has 8 divisors (see below), whose sum is σ = 3362400. Its totient is φ = 2017296.

The previous prime is 2661797. The next prime is 2661821. The reversal of 2661805 is 5081662.

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

It is a cyclic number.

It is not a de Polignac number, because 2661805 - 2³ = 2661797 is a prime.

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, 13915 + ... + 14104.

It is an arithmetic number, because the mean of its divisors is an integer number (420300).

2^2661805 is an apocalyptic number.

It is an amenable number.

2661805 is a deficient number, since it is larger than the sum of its proper divisors (700595).

2661805 is a wasteful number, since it uses less digits than its factorization.

2661805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28043.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2661805 is about 1631.5039074425. The cubic root of 2661805 is about 138.5879313203.

The spelling of 2661805 in words is "two million, six hundred sixty-one thousand, eight hundred five".