405545155 has 4 divisors (see below), whose sum is σ = 486654192. Its totient is φ = 324436120.

The previous prime is 405545137. The next prime is 405545159. The reversal of 405545155 is 551545504.

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

It is not a de Polignac number, because 405545155 - 2¹⁷ = 405414083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405545155.

It is not an unprimeable number, because it can be changed into a prime (405545159) 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, 40554511 + ... + 40554520.

It is an arithmetic number, because the mean of its divisors is an integer number (121663548).

Almost surely, 2^405545155 is an apocalyptic number.

405545155 is a deficient number, since it is larger than the sum of its proper divisors (81109037).

405545155 is an equidigital number, since it uses as much as digits as its factorization.

405545155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81109036.

The product of its (nonzero) digits is 50000, while the sum is 34.

The square root of 405545155 is about 20138.1517275047. The cubic root of 405545155 is about 740.1954408296.

The spelling of 405545155 in words is "four hundred five million, five hundred forty-five thousand, one hundred fifty-five".