401005155 has 32 divisors (see below), whose sum is σ = 664511040. Its totient is φ = 206369280.

The previous prime is 401005147. The next prime is 401005159. The reversal of 401005155 is 551500104.

It is not a de Polignac number, because 401005155 - 2³ = 401005147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (401005159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44361 + ... + 52629.

It is an arithmetic number, because the mean of its divisors is an integer number (20765970).

Almost surely, 2^401005155 is an apocalyptic number.

401005155 is a deficient number, since it is larger than the sum of its proper divisors (263505885).

401005155 is a wasteful number, since it uses less digits than its factorization.

401005155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8391.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 401005155 is about 20025.1131082948. The cubic root of 401005155 is about 737.4229539354.

Adding to 401005155 its reverse (551500104), we get a palindrome (952505259).

The spelling of 401005155 in words is "four hundred one million, five thousand, one hundred fifty-five".