405305121 has 16 divisors (see below), whose sum is σ = 582563520. Its totient is φ = 249167040.

The previous prime is 405305119. The next prime is 405305171. The reversal of 405305121 is 121503504.

It is not a de Polignac number, because 405305121 - 2¹ = 405305119 is a prime.

It is a super-2 number, since 2×405305121² = 328544482217649282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (405305101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38566 + ... + 47936.

It is an arithmetic number, because the mean of its divisors is an integer number (36410220).

Almost surely, 2^405305121 is an apocalyptic number.

It is an amenable number.

405305121 is a deficient number, since it is larger than the sum of its proper divisors (177258399).

405305121 is a wasteful number, since it uses less digits than its factorization.

405305121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10496.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 405305121 is about 20132.1911624145. The cubic root of 405305121 is about 740.0493764228.

Adding to 405305121 its reverse (121503504), we get a palindrome (526808625).

The spelling of 405305121 in words is "four hundred five million, three hundred five thousand, one hundred twenty-one".