405145 has 16 divisors (see below), whose sum is σ = 548352. Its totient is φ = 285120.

The previous prime is 405143. The next prime is 405157. The reversal of 405145 is 541504.

It is not a de Polignac number, because 405145 - 2¹ = 405143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405143) 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, 1360 + ... + 1630.

It is an arithmetic number, because the mean of its divisors is an integer number (34272).

2⁴⁰⁵¹⁴⁵ is an apocalyptic number.

It is an amenable number.

405145 is a deficient number, since it is larger than the sum of its proper divisors (143207).

405145 is a wasteful number, since it uses less digits than its factorization.

405145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 405145 is about 636.5100156321. The cubic root of 405145 is about 73.9951908245.

Adding to 405145 its reverse (541504), we get a palindrome (946649).

It can be divided in two parts, 4051 and 45, that added together give a 12-th power (4096 = 2¹²).

The spelling of 405145 in words is "four hundred five thousand, one hundred forty-five".