1040821805 has 16 divisors (see below), whose sum is σ = 1315516800. Its totient is φ = 788356800.

The previous prime is 1040821799. The next prime is 1040821819. The reversal of 1040821805 is 5081280401.

It is a de Polignac number, because none of the positive numbers 2^k-1040821805 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311936 + ... + 315254.

It is an arithmetic number, because the mean of its divisors is an integer number (82219800).

Almost surely, 2^1040821805 is an apocalyptic number.

It is an amenable number.

1040821805 is a deficient number, since it is larger than the sum of its proper divisors (274694995).

1040821805 is a wasteful number, since it uses less digits than its factorization.

1040821805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6644.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 1040821805 is about 32261.7700227374. The cubic root of 1040821805 is about 1013.4261987718.

The spelling of 1040821805 in words is "one billion, forty million, eight hundred twenty-one thousand, eight hundred five".