400405255516 has 24 divisors (see below), whose sum is σ = 801067438080. Its totient is φ = 171547196592.

The previous prime is 400405255501. The next prime is 400405255589. The reversal of 400405255516 is 615552504004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2205100 + ... + 2379763.

It is an arithmetic number, because the mean of its divisors is an integer number (33377809920).

Almost surely, 2^400405255516 is an apocalyptic number.

It is an amenable number.

400405255516 is an abundant number, since it is smaller than the sum of its proper divisors (400662182564).

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

400405255516 is a wasteful number, since it uses less digits than its factorization.

400405255516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587993 (or 4587991 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 400405255516 in words is "four hundred billion, four hundred five million, two hundred fifty-five thousand, five hundred sixteen".