400043320 has 64 divisors (see below), whose sum is σ = 973399680. Its totient is φ = 147388416.

The previous prime is 400043299. The next prime is 400043327. The reversal of 400043320 is 23340004.

It is a junction number, because it is equal to n+sod(n) for n = 400043294 and 400043303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400043327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25702 + ... + 38218.

It is an arithmetic number, because the mean of its divisors is an integer number (15209370).

Almost surely, 2^400043320 is an apocalyptic number.

400043320 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 400043320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486699840).

400043320 is an abundant number, since it is smaller than the sum of its proper divisors (573356360).

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

400043320 is a wasteful number, since it uses less digits than its factorization.

400043320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12592 (or 12588 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 400043320 is about 20001.0829706794. The cubic root of 400043320 is about 736.8328974753.

Adding to 400043320 its reverse (23340004), we get a palindrome (423383324).

The spelling of 400043320 in words is "four hundred million, forty-three thousand, three hundred twenty".