404407138 has 4 divisors (see below), whose sum is σ = 606610710. Its totient is φ = 202203568.

The previous prime is 404407099. The next prime is 404407139. The reversal of 404407138 is 831704404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 304746849 + 99660289 = 17457^2 + 9983^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (404407139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101101783 + ... + 101101786.

Almost surely, 2^404407138 is an apocalyptic number.

404407138 is a deficient number, since it is larger than the sum of its proper divisors (202203572).

404407138 is a wasteful number, since it uses less digits than its factorization.

404407138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202203571.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 404407138 is about 20109.8766281646. The cubic root of 404407138 is about 739.5024278670.

The spelling of 404407138 in words is "four hundred four million, four hundred seven thousand, one hundred thirty-eight".