400378411992 has 128 divisors (see below), whose sum is σ = 1086111452160. Its totient is φ = 122262773760.

The previous prime is 400378411891. The next prime is 400378412003. The reversal of 400378411992 is 299114873004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25945383 + ... + 25960809.

It is an arithmetic number, because the mean of its divisors is an integer number (8485245720).

Almost surely, 2^400378411992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400378411992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543055726080).

400378411992 is an abundant number, since it is smaller than the sum of its proper divisors (685733040168).

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

400378411992 is a wasteful number, since it uses less digits than its factorization.

400378411992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16073 (or 16069 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 400378411992 in words is "four hundred billion, three hundred seventy-eight million, four hundred eleven thousand, nine hundred ninety-two".