400040399988 has 72 divisors (see below), whose sum is σ = 1035099793728. Its totient is φ = 130199142528.

The previous prime is 400040399981. The next prime is 400040400047. The reversal of 400040399988 is 889993040004.

400040399988 is a `hidden beast` number, since 400 + 0 + 40 + 39 + 99 + 88 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040399981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4424320 + ... + 4513832.

It is an arithmetic number, because the mean of its divisors is an integer number (14376386024).

Almost surely, 2^400040399988 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 400040399988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (517549896864).

400040399988 is an abundant number, since it is smaller than the sum of its proper divisors (635059393740).

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

400040399988 is a wasteful number, since it uses less digits than its factorization.

400040399988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92453 (or 92448 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 400040399988 in words is "four hundred billion, forty million, three hundred ninety-nine thousand, nine hundred eighty-eight".