2491905 has 24 divisors (see below), whose sum is σ = 4321728. Its totient is φ = 1225536.

The previous prime is 2491903. The next prime is 2491933. The reversal of 2491905 is 5091942.

It is a happy number.

It is not a de Polignac number, because 2491905 - 2¹ = 2491903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2491903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2044 + ... + 3026.

It is an arithmetic number, because the mean of its divisors is an integer number (180072).

2^2491905 is an apocalyptic number.

It is an amenable number.

2491905 is a deficient number, since it is larger than the sum of its proper divisors (1829823).

2491905 is a wasteful number, since it uses less digits than its factorization.

2491905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2491905 is about 1578.5768907469. The cubic root of 2491905 is about 135.5742343645.

The spelling of 2491905 in words is "two million, four hundred ninety-one thousand, nine hundred five".