404640004 has 6 divisors (see below), whose sum is σ = 708120014. Its totient is φ = 202320000.

The previous prime is 404639971. The next prime is 404640007. The reversal of 404640004 is 400046404.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 374499904 + 30140100 = 19352^2 + 5490^2 .

It is not an unprimeable number, because it can be changed into a prime (404640007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50579997 + ... + 50580004.

Almost surely, 2^404640004 is an apocalyptic number.

It is an amenable number.

404640004 is a deficient number, since it is larger than the sum of its proper divisors (303480010).

404640004 is a wasteful number, since it uses less digits than its factorization.

404640004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101160005 (or 101160003 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 404640004 is about 20115.6656365132. The cubic root of 404640004 is about 739.6443408995.

Adding to 404640004 its reverse (400046404), we get a palindrome (804686408).

The spelling of 404640004 in words is "four hundred four million, six hundred forty thousand, four".