400039804 has 24 divisors (see below), whose sum is σ = 725286240. Its totient is φ = 192835776.

The previous prime is 400039789. The next prime is 400039807. The reversal of 400039804 is 408930004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400039807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90289 + ... + 94615.

It is an arithmetic number, because the mean of its divisors is an integer number (30220260).

Almost surely, 2^400039804 is an apocalyptic number.

It is an amenable number.

400039804 is a deficient number, since it is larger than the sum of its proper divisors (325246436).

400039804 is a wasteful number, since it uses less digits than its factorization.

400039804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5157 (or 5155 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 400039804 is about 20000.9950752456. The cubic root of 400039804 is about 736.8307387824.

Adding to 400039804 its reverse (408930004), we get a palindrome (808969808).

The spelling of 400039804 in words is "four hundred million, thirty-nine thousand, eight hundred four".