405018 has 12 divisors (see below), whose sum is σ = 877578. Its totient is φ = 135000.

The previous prime is 405011. The next prime is 405029. The reversal of 405018 is 810504.

It can be written as a sum of positive squares in only one way, i.e., 205209 + 199809 = 453^2 + 447^2 .

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 22501 = 405018 / (4 + 0 + 5 + 0 + 1 + 8).

It is not an unprimeable number, because it can be changed into a prime (405011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11233 + ... + 11268.

2⁴⁰⁵⁰¹⁸ is an apocalyptic number.

405018 is an abundant number, since it is smaller than the sum of its proper divisors (472560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405018 is a wasteful number, since it uses less digits than its factorization.

405018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22509 (or 22506 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 405018 is about 636.4102450464. The cubic root of 405018 is about 73.9874583079.

It can be divided in two parts, 4050 and 18, that multiplied together give a square (72900 = 270²).

The spelling of 405018 in words is "four hundred five thousand, eighteen".