400444408 has 32 divisors (see below), whose sum is σ = 924104160. Its totient is φ = 158417280.

The previous prime is 400444403. The next prime is 400444409. The reversal of 400444408 is 804444004.

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 (400444403) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 274303 + ... + 275758.

It is an arithmetic number, because the mean of its divisors is an integer number (28878255).

Almost surely, 2^400444408 is an apocalyptic number.

It is an amenable number.

400444408 is an abundant number, since it is smaller than the sum of its proper divisors (523659752).

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

400444408 is a wasteful number, since it uses less digits than its factorization.

400444408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550087 (or 550083 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

The square root of 400444408 is about 20011.1071157995. The cubic root of 400444408 is about 737.0790675812.

The spelling of 400444408 in words is "four hundred million, four hundred forty-four thousand, four hundred eight".