400004432 has 10 divisors (see below), whose sum is σ = 775008618. Its totient is φ = 200002208.

The previous prime is 400004419. The next prime is 400004471. The reversal of 400004432 is 234400004.

It can be written as a sum of positive squares in only one way, i.e., 226924096 + 173080336 = 15064^2 + 13156^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400004432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500123 + ... + 12500154.

Almost surely, 2^400004432 is an apocalyptic number.

It is an amenable number.

400004432 is a deficient number, since it is larger than the sum of its proper divisors (375004186).

400004432 is a wasteful number, since it uses less digits than its factorization.

400004432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25000285 (or 25000279 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 400004432 is about 20000.1107996931. The cubic root of 400004432 is about 736.8090209893.

Adding to 400004432 its reverse (234400004), we get a palindrome (634404436).

The spelling of 400004432 in words is "four hundred million, four thousand, four hundred thirty-two".