400543881378 has 64 divisors (see below), whose sum is σ = 815838262272. Its totient is φ = 131073485760.

The previous prime is 400543881343. The next prime is 400543881403. The reversal of 400543881378 is 873188345004.

It is a self number, because there is not a number n which added to its sum of digits gives 400543881378.

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, 125051125 + ... + 125054327.

It is an arithmetic number, because the mean of its divisors is an integer number (12747472848).

Almost surely, 2^400543881378 is an apocalyptic number.

400543881378 is an abundant number, since it is smaller than the sum of its proper divisors (415294380894).

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

400543881378 is a wasteful number, since it uses less digits than its factorization.

400543881378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439.

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 400543881378 in words is "four hundred billion, five hundred forty-three million, eight hundred eighty-one thousand, three hundred seventy-eight".