404404394 has 8 divisors (see below), whose sum is σ = 607181508. Its totient is φ = 202010560.

The previous prime is 404404387. The next prime is 404404411. The reversal of 404404394 is 493404404.

It can be written as a sum of positive squares in 2 ways, for example, as 399400225 + 5004169 = 19985^2 + 2237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 404404394.

It is an unprimeable number.

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, 93167 + ... + 97410.

Almost surely, 2^404404394 is an apocalyptic number.

404404394 is a deficient number, since it is larger than the sum of its proper divisors (202777114).

404404394 is a wasteful number, since it uses less digits than its factorization.

404404394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191640.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 404404394 is about 20109.8084028665. The cubic root of 404404394 is about 739.5007552958.

Adding to 404404394 its reverse (493404404), we get a palindrome (897808798).

The spelling of 404404394 in words is "four hundred four million, four hundred four thousand, three hundred ninety-four".