400395366 has 72 divisors (see below), whose sum is σ = 1037703240. Its totient is φ = 114104592.

The previous prime is 400395323. The next prime is 400395367. The reversal of 400395366 is 663593004.

It is a super-2 number, since 2×400395366² = 320632898228547912, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400395366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400395367) 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 35 ways as a sum of consecutive naturals, for example, 1029100 + ... + 1029488.

It is an arithmetic number, because the mean of its divisors is an integer number (14412545).

Almost surely, 2^400395366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400395366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (518851620).

400395366 is an abundant number, since it is smaller than the sum of its proper divisors (637307874).

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

400395366 is an equidigital number, since it uses as much as digits as its factorization.

400395366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 400395366 is about 20009.8817087958. The cubic root of 400395366 is about 737.0489765901.

The spelling of 400395366 in words is "four hundred million, three hundred ninety-five thousand, three hundred sixty-six".