400899328 has 36 divisors (see below), whose sum is σ = 803224548. Its totient is φ = 199700480.

The previous prime is 400899311. The next prime is 400899377. The reversal of 400899328 is 823998004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 122943744 + 277955584 = 11088^2 + 16672^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69150 + ... + 74722.

It is an arithmetic number, because the mean of its divisors is an integer number (22311793).

Almost surely, 2^400899328 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 400899328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401612274).

400899328 is an abundant number, since it is smaller than the sum of its proper divisors (402325220).

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

400899328 is an equidigital number, since it uses as much as digits as its factorization.

400899328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5870 (or 5856 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 400899328 is about 20022.4705768294. The cubic root of 400899328 is about 737.3580785226.

The spelling of 400899328 in words is "four hundred million, eight hundred ninety-nine thousand, three hundred twenty-eight".