400381356408 has 128 divisors (see below), whose sum is σ = 1116758016000. Its totient is φ = 118578446720.

The previous prime is 400381356391. The next prime is 400381356409. The reversal of 400381356408 is 804653183004.

It is a self number, because there is not a number n which added to its sum of digits gives 400381356408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400381356409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8898913 + ... + 8943791.

It is an arithmetic number, because the mean of its divisors is an integer number (8724672000).

Almost surely, 2^400381356408 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 400381356408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (558379008000).

400381356408 is an abundant number, since it is smaller than the sum of its proper divisors (716376659592).

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

400381356408 is a wasteful number, since it uses less digits than its factorization.

400381356408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45665 (or 45661 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 400381356408 in words is "four hundred billion, three hundred eighty-one million, three hundred fifty-six thousand, four hundred eight".