404130729 has 4 divisors (see below), whose sum is σ = 538840976. Its totient is φ = 269420484.

The previous prime is 404130721. The next prime is 404130739. The reversal of 404130729 is 927031404.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 404130729 - 2³ = 404130721 is a prime.

It is a super-2 number, since 2×404130729² = 326643292244142882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404130696 and 404130705.

It is not an unprimeable number, because it can be changed into a prime (404130721) by changing a digit.

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, 67355119 + ... + 67355124.

It is an arithmetic number, because the mean of its divisors is an integer number (134710244).

Almost surely, 2^404130729 is an apocalyptic number.

It is an amenable number.

404130729 is a deficient number, since it is larger than the sum of its proper divisors (134710247).

404130729 is a wasteful number, since it uses less digits than its factorization.

404130729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134710246.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 404130729 is about 20103.0029846289. The cubic root of 404130729 is about 739.3339081627. Note that the first 3 decimals are identical.

The spelling of 404130729 in words is "four hundred four million, one hundred thirty thousand, seven hundred twenty-nine".