1649874905 has 32 divisors (see below), whose sum is σ = 2399777280. Its totient is φ = 1063019520.

The previous prime is 1649874857. The next prime is 1649874923. The reversal of 1649874905 is 5094789461.

It is not a de Polignac number, because 1649874905 - 2⁶ = 1649874841 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419900 + ... + 423810.

It is an arithmetic number, because the mean of its divisors is an integer number (74993040).

Almost surely, 2^1649874905 is an apocalyptic number.

It is an amenable number.

1649874905 is a deficient number, since it is larger than the sum of its proper divisors (749902375).

1649874905 is a wasteful number, since it uses less digits than its factorization.

1649874905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4649.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 1649874905 is about 40618.6521809870. The cubic root of 1649874905 is about 1181.6358869901.

The spelling of 1649874905 in words is "one billion, six hundred forty-nine million, eight hundred seventy-four thousand, nine hundred five".