1804921641 has 12 divisors (see below), whose sum is σ = 2619467760. Its totient is φ = 1197577080.

The previous prime is 1804921631. The next prime is 1804921669. The reversal of 1804921641 is 1461294081.

1804921641 is a `hidden beast` number, since 1 + 8 + 0 + 4 + 9 + 2 + 1 + 641 = 666.

It is not a de Polignac number, because 1804921641 - 2⁵ = 1804921609 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1804921596 and 1804921605.

It is not an unprimeable number, because it can be changed into a prime (1804921631) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 473331 + ... + 477128.

It is an arithmetic number, because the mean of its divisors is an integer number (218288980).

Almost surely, 2^1804921641 is an apocalyptic number.

It is an amenable number.

1804921641 is a deficient number, since it is larger than the sum of its proper divisors (814546119).

1804921641 is a wasteful number, since it uses less digits than its factorization.

1804921641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950676 (or 950673 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1804921641 is about 42484.3693727470. The cubic root of 1804921641 is about 1217.5480722037.

The spelling of 1804921641 in words is "one billion, eight hundred four million, nine hundred twenty-one thousand, six hundred forty-one".