405400155 has 16 divisors (see below), whose sum is σ = 649128480. Its totient is φ = 216050688.

The previous prime is 405400153. The next prime is 405400187. The reversal of 405400155 is 551004504.

It is not a de Polignac number, because 405400155 - 2¹ = 405400153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405400153) 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, 11979 + ... + 30891.

It is an arithmetic number, because the mean of its divisors is an integer number (40570530).

Almost surely, 2^405400155 is an apocalyptic number.

405400155 is a deficient number, since it is larger than the sum of its proper divisors (243728325).

405400155 is a wasteful number, since it uses less digits than its factorization.

405400155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20350.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 405400155 is about 20134.5512738675. The cubic root of 405400155 is about 740.1072129783.

Adding to 405400155 its reverse (551004504), we get a palindrome (956404659).

The spelling of 405400155 in words is "four hundred five million, four hundred thousand, one hundred fifty-five".