405040165 has 4 divisors (see below), whose sum is σ = 486048204. Its totient is φ = 324032128.

The previous prime is 405040159. The next prime is 405040193. The reversal of 405040165 is 561040504.

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 196728676 + 208311489 = 14026^2 + 14433^2 .

It is a cyclic number.

It is not a de Polignac number, because 405040165 - 2⁷ = 405040037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 40504012 + ... + 40504021.

It is an arithmetic number, because the mean of its divisors is an integer number (121512051).

Almost surely, 2^405040165 is an apocalyptic number.

It is an amenable number.

405040165 is a deficient number, since it is larger than the sum of its proper divisors (81008039).

405040165 is an equidigital number, since it uses as much as digits as its factorization.

405040165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81008038.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 405040165 is about 20125.6096802060. The cubic root of 405040165 is about 739.8880796161. Note that the first 3 decimals are identical.

Adding to 405040165 its reverse (561040504), we get a palindrome (966080669).

The spelling of 405040165 in words is "four hundred five million, forty thousand, one hundred sixty-five".