405806836 has 12 divisors (see below), whose sum is σ = 725272128. Its totient is φ = 198586232.

The previous prime is 405806777. The next prime is 405806851. The reversal of 405806836 is 638608504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079086 + ... + 1079461.

It is an arithmetic number, because the mean of its divisors is an integer number (60439344).

Almost surely, 2^405806836 is an apocalyptic number.

It is an amenable number.

405806836 is a deficient number, since it is larger than the sum of its proper divisors (319465292).

405806836 is a wasteful number, since it uses less digits than its factorization.

405806836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158598 (or 2158596 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 405806836 is about 20144.6478251669. The cubic root of 405806836 is about 740.3546121201.

The spelling of 405806836 in words is "four hundred five million, eight hundred six thousand, eight hundred thirty-six".