405505001 has 12 divisors (see below), whose sum is σ = 450147012. Its totient is φ = 364980000.

The previous prime is 405504991. The next prime is 405505013. The reversal of 405505001 is 100505504.

It can be written as a sum of positive squares in 2 ways, for example, as 303979225 + 101525776 = 17435^2 + 10076^2 .

It is not a de Polignac number, because 405505001 - 2⁶ = 405504937 is a prime.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405505021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4370 + ... + 28811.

It is an arithmetic number, because the mean of its divisors is an integer number (37512251).

Almost surely, 2^405505001 is an apocalyptic number.

It is an amenable number.

405505001 is a deficient number, since it is larger than the sum of its proper divisors (44642011).

405505001 is a wasteful number, since it uses less digits than its factorization.

405505001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33304 (or 33293 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 405505001 is about 20137.1547394363. The cubic root of 405505001 is about 740.1710105138.

The spelling of 405505001 in words is "four hundred five million, five hundred five thousand, one".