6404432 has 10 divisors (see below), whose sum is σ = 12408618. Its totient is φ = 3202208.

The previous prime is 6404407. The next prime is 6404449. The reversal of 6404432 is 2344046.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6370576 + 33856 = 2524^2 + 184^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6404398 and 6404407.

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, 200123 + ... + 200154.

Almost surely, 2^6404432 is an apocalyptic number.

It is an amenable number.

6404432 is a deficient number, since it is larger than the sum of its proper divisors (6004186).

6404432 is a wasteful number, since it uses less digits than its factorization.

6404432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400285 (or 400279 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 6404432 is about 2530.6979274501. The cubic root of 6404432 is about 185.7064007923.

Adding to 6404432 its reverse (2344046), we get a palindrome (8748478).

The spelling of 6404432 in words is "six million, four hundred four thousand, four hundred thirty-two".