2491405 has 12 divisors (see below), whose sum is σ = 3478140. Its totient is φ = 1708224.

The previous prime is 2491397. The next prime is 2491453. The reversal of 2491405 is 5041942.

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 777924 = 1309^2 + 882^2 .

It is not a de Polignac number, because 2491405 - 2³ = 2491397 is a prime.

2491405 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2491405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4840 + ... + 5329.

It is an arithmetic number, because the mean of its divisors is an integer number (289845).

2^2491405 is an apocalyptic number.

It is an amenable number.

2491405 is a deficient number, since it is larger than the sum of its proper divisors (986735).

2491405 is a wasteful number, since it uses less digits than its factorization.

2491405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10188 (or 10181 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2491405 is about 1578.4185123091. The cubic root of 2491405 is about 135.5651661147.

The spelling of 2491405 in words is "two million, four hundred ninety-one thousand, four hundred five".