405155 has 4 divisors (see below), whose sum is σ = 486192. Its totient is φ = 324120.

The previous prime is 405143. The next prime is 405157. The reversal of 405155 is 551504.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 405155 - 2⁶ = 405091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40511 + ... + 40520.

It is an arithmetic number, because the mean of its divisors is an integer number (121548).

2⁴⁰⁵¹⁵⁵ is an apocalyptic number.

405155 is a deficient number, since it is larger than the sum of its proper divisors (81037).

405155 is an equidigital number, since it uses as much as digits as its factorization.

405155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81036.

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

The square root of 405155 is about 636.5178709196. The cubic root of 405155 is about 73.9957996155.

Adding to 405155 its reverse (551504), we get a palindrome (956659).

The spelling of 405155 in words is "four hundred five thousand, one hundred fifty-five".