404136461 has 4 divisors (see below), whose sum is σ = 427909212. Its totient is φ = 380363712.

The previous prime is 404136457. The next prime is 404136487. The reversal of 404136461 is 164631404.

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

It can be written as a sum of positive squares in 2 ways, for example, as 135373225 + 268763236 = 11635^2 + 16394^2 .

It is not a de Polignac number, because 404136461 - 2² = 404136457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404136401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11886350 + ... + 11886383.

It is an arithmetic number, because the mean of its divisors is an integer number (106977303).

Almost surely, 2^404136461 is an apocalyptic number.

It is an amenable number.

404136461 is a deficient number, since it is larger than the sum of its proper divisors (23772751).

404136461 is a wasteful number, since it uses less digits than its factorization.

404136461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23772750.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 404136461 is about 20103.1455498885. The cubic root of 404136461 is about 739.3374036008.

Adding to 404136461 its reverse (164631404), we get a palindrome (568767865).

The spelling of 404136461 in words is "four hundred four million, one hundred thirty-six thousand, four hundred sixty-one".