402005444 has 12 divisors (see below), whose sum is σ = 722523564. Its totient is φ = 195570144.

The previous prime is 402005413. The next prime is 402005447. The reversal of 402005444 is 444500204.

It can be written as a sum of positive squares in 2 ways, for example, as 272910400 + 129095044 = 16520^2 + 11362^2 .

It is not an unprimeable number, because it can be changed into a prime (402005447) 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 3 ways as a sum of consecutive naturals, for example, 1357979 + ... + 1358274.

It is an arithmetic number, because the mean of its divisors is an integer number (60210297).

Almost surely, 2^402005444 is an apocalyptic number.

It is an amenable number.

402005444 is a deficient number, since it is larger than the sum of its proper divisors (320518120).

402005444 is a wasteful number, since it uses less digits than its factorization.

402005444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716294 (or 2716292 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 402005444 is about 20050.0734163244. The cubic root of 402005444 is about 738.0356007434.

Adding to 402005444 its reverse (444500204), we get a palindrome (846505648).

The spelling of 402005444 in words is "four hundred two million, five thousand, four hundred forty-four".