400000004 has 12 divisors (see below), whose sum is σ = 741176604. Its totient is φ = 188235264.

The previous prime is 399999959. The next prime is 400000009.

It is a happy number.

400000004 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 311451904 + 88548100 = 17648^2 + 9410^2 .

It is a junction number, because it is equal to n+sod(n) for n = 399999937 and 400000000.

It is not an unprimeable number, because it can be changed into a prime (400000009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2941109 + ... + 2941244.

It is an arithmetic number, because the mean of its divisors is an integer number (61764717).

Almost surely, 2^400000004 is an apocalyptic number.

It is an amenable number.

400000004 is a deficient number, since it is larger than the sum of its proper divisors (341176600).

400000004 is a wasteful number, since it uses less digits than its factorization.

400000004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882374 (or 5882372 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 400000004 is about 20000.0001000000. Note that the first 3 decimals coincide. The cubic root of 400000004 is about 736.8063021841.

It can be divided in two parts, 40000000 and 4, that added together give a palindrome (40000004).

The spelling of 400000004 in words is "four hundred million, four", and thus it is an aban number.