2660891 has 8 divisors (see below), whose sum is σ = 2835504. Its totient is φ = 2488320.

The previous prime is 2660887. The next prime is 2660899. The reversal of 2660891 is 1980662.

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 2660891 - 2² = 2660887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2660899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2876 + ... + 3686.

It is an arithmetic number, because the mean of its divisors is an integer number (354438).

2^2660891 is an apocalyptic number.

2660891 is a deficient number, since it is larger than the sum of its proper divisors (174613).

2660891 is a wasteful number, since it uses less digits than its factorization.

2660891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2660891 is about 1631.2237737355. The cubic root of 2660891 is about 138.5720669137.

The spelling of 2660891 in words is "two million, six hundred sixty thousand, eight hundred ninety-one".