400813336 has 96 divisors (see below), whose sum is σ = 960007680. Its totient is φ = 155584800.

The previous prime is 400813331. The next prime is 400813337. The reversal of 400813336 is 633318004.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400813331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1478881 + ... + 1479151.

It is an arithmetic number, because the mean of its divisors is an integer number (10000080).

Almost surely, 2^400813336 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 400813336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (480003840).

400813336 is an abundant number, since it is smaller than the sum of its proper divisors (559194344).

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

400813336 is an equidigital number, since it uses as much as digits as its factorization.

400813336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 400813336 is about 20020.3230743163. The cubic root of 400813336 is about 737.3053542054.

The spelling of 400813336 in words is "four hundred million, eight hundred thirteen thousand, three hundred thirty-six".