404620561 has 4 divisors (see below), whose sum is σ = 425916400. Its totient is φ = 383324724.

The previous prime is 404620549. The next prime is 404620591. The reversal of 404620561 is 165026404.

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 a cyclic number.

It is not a de Polignac number, because 404620561 - 2⁵ = 404620529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404620511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10647891 + ... + 10647928.

It is an arithmetic number, because the mean of its divisors is an integer number (106479100).

Almost surely, 2^404620561 is an apocalyptic number.

It is an amenable number.

404620561 is a deficient number, since it is larger than the sum of its proper divisors (21295839).

404620561 is a wasteful number, since it uses less digits than its factorization.

404620561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21295838.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 404620561 is about 20115.1823506525. The cubic root of 404620561 is about 739.6324940437.

Adding to 404620561 its reverse (165026404), we get a palindrome (569646965).

The spelling of 404620561 in words is "four hundred four million, six hundred twenty thousand, five hundred sixty-one".