2491785 has 12 divisors (see below), whose sum is σ = 4319172. Its totient is φ = 1328928.

The previous prime is 2491777. The next prime is 2491787. The reversal of 2491785 is 5871942.

It can be written as a sum of positive squares in 2 ways, for example, as 1382976 + 1108809 = 1176^2 + 1053^2 .

It is not a de Polignac number, because 2491785 - 2³ = 2491777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2491787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27642 + ... + 27731.

It is an arithmetic number, because the mean of its divisors is an integer number (359931).

2^2491785 is an apocalyptic number.

It is an amenable number.

2491785 is a deficient number, since it is larger than the sum of its proper divisors (1827387).

2491785 is a wasteful number, since it uses less digits than its factorization.

2491785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55384 (or 55381 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2491785 is about 1578.5388813710. The cubic root of 2491785 is about 135.5720580952.

It can be divided in two parts, 24 and 91785, that added together give a square (91809 = 303²).

The spelling of 2491785 in words is "two million, four hundred ninety-one thousand, seven hundred eighty-five".