400032423240 has 128 divisors (see below), whose sum is σ = 1217168294400. Its totient is φ = 105162071040.

The previous prime is 400032423229. The next prime is 400032423283. The reversal of 400032423240 is 42324230004.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 400032423240.

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 31 ways as a sum of consecutive naturals, for example, 6158130 + ... + 6222750.

It is an arithmetic number, because the mean of its divisors is an integer number (9509127300).

Almost surely, 2^400032423240 is an apocalyptic number.

400032423240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400032423240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (608584147200).

400032423240 is an abundant number, since it is smaller than the sum of its proper divisors (817135871160).

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

400032423240 is a wasteful number, since it uses less digits than its factorization.

400032423240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65367 (or 65363 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

Adding to 400032423240 its reverse (42324230004), we get a palindrome (442356653244).

The spelling of 400032423240 in words is "four hundred billion, thirty-two million, four hundred twenty-three thousand, two hundred forty".