405799646 has 32 divisors (see below), whose sum is σ = 718889472. Its totient is φ = 168164640.

The previous prime is 405799619. The next prime is 405799721. The reversal of 405799646 is 646997504.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 405799594 and 405799603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84161 + ... + 88851.

It is an arithmetic number, because the mean of its divisors is an integer number (22465296).

Almost surely, 2^405799646 is an apocalyptic number.

405799646 is a deficient number, since it is larger than the sum of its proper divisors (313089826).

405799646 is a wasteful number, since it uses less digits than its factorization.

405799646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4904.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 405799646 is about 20144.4693650640. The cubic root of 405799646 is about 740.3502396120.

The spelling of 405799646 in words is "four hundred five million, seven hundred ninety-nine thousand, six hundred forty-six".