400005409956 has 12 divisors (see below), whose sum is σ = 933345956592. Its totient is φ = 133335136648.

The previous prime is 400005409943. The next prime is 400005409997. The reversal of 400005409956 is 659904500004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 16666892070 + ... + 16666892093.

It is an arithmetic number, because the mean of its divisors is an integer number (77778829716).

Almost surely, 2^400005409956 is an apocalyptic number.

It is an amenable number.

400005409956 is an abundant number, since it is smaller than the sum of its proper divisors (533340546636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400005409956 is a wasteful number, since it uses less digits than its factorization.

400005409956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333784170 (or 33333784168 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 400005409956 in words is "four hundred billion, five million, four hundred nine thousand, nine hundred fifty-six".