2881605 has 16 divisors (see below), whose sum is σ = 4760064. Its totient is φ = 1487040.

The previous prime is 2881591. The next prime is 2881621. The reversal of 2881605 is 5061882.

It is not a de Polignac number, because 2881605 - 2⁴ = 2881589 is a prime.

2881605 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2634 + ... + 3563.

It is an arithmetic number, because the mean of its divisors is an integer number (297504).

2^2881605 is an apocalyptic number.

It is an amenable number.

2881605 is a deficient number, since it is larger than the sum of its proper divisors (1878459).

2881605 is a wasteful number, since it uses less digits than its factorization.

2881605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6236.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 2881605 is about 1697.5290866433. The cubic root of 2881605 is about 142.3021569647.

It can be divided in two parts, 2881 and 605, that added together give a triangular number (3486 = T₈₃).

The spelling of 2881605 in words is "two million, eight hundred eighty-one thousand, six hundred five".