405040145 has 4 divisors (see below), whose sum is σ = 486048180. Its totient is φ = 324032112.

The previous prime is 405040109. The next prime is 405040159. The reversal of 405040145 is 541040504.

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 293505424 + 111534721 = 17132^2 + 10561^2 .

It is a cyclic number.

It is not a de Polignac number, because 405040145 - 2¹⁴ = 405023761 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 405040145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40504010 + ... + 40504019.

It is an arithmetic number, because the mean of its divisors is an integer number (121512045).

Almost surely, 2^405040145 is an apocalyptic number.

It is an amenable number.

405040145 is a deficient number, since it is larger than the sum of its proper divisors (81008035).

405040145 is an equidigital number, since it uses as much as digits as its factorization.

405040145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81008034.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 405040145 is about 20125.6091833266. The cubic root of 405040145 is about 739.8880674381. Note that the first 3 decimals are identical.

Adding to 405040145 its reverse (541040504), we get a palindrome (946080649).

The spelling of 405040145 in words is "four hundred five million, forty thousand, one hundred forty-five".