400004002 has 16 divisors (see below), whose sum is σ = 607156992. Its totient is φ = 197627040.

The previous prime is 400003997. The next prime is 400004009. The reversal of 400004002 is 200400004.

It is a self number, because there is not a number n which added to its sum of digits gives 400004002.

It is not an unprimeable number, because it can be changed into a prime (400004009) 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 7 ways as a sum of consecutive naturals, for example, 105463 + ... + 109189.

It is an arithmetic number, because the mean of its divisors is an integer number (37947312).

Almost surely, 2^400004002 is an apocalyptic number.

400004002 is a deficient number, since it is larger than the sum of its proper divisors (207152990).

400004002 is a wasteful number, since it uses less digits than its factorization.

400004002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353.

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 400004002 is about 20000.1000497498. The cubic root of 400004002 is about 736.8087569689.

Adding to 400004002 its reverse (200400004), we get a palindrome (600404006).

The spelling of 400004002 in words is "four hundred million, four thousand, two".