401555 has 24 divisors (see below), whose sum is σ = 615600. Its totient is φ = 248640.

The previous prime is 401551. The next prime is 401567. The reversal of 401555 is 555104.

It is not a de Polignac number, because 401555 - 2² = 401551 is a prime.

It is a super-2 number, since 2×401555² = 322492836050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2621 + ... + 2769.

It is an arithmetic number, because the mean of its divisors is an integer number (25650).

2⁴⁰¹⁵⁵⁵ is an apocalyptic number.

401555 is a deficient number, since it is larger than the sum of its proper divisors (214045).

401555 is a wasteful number, since it uses less digits than its factorization.

401555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 172 counting only the distinct ones).

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

The square root of 401555 is about 633.6836750304. The cubic root of 401555 is about 73.7759843323.

Adding to 401555 its reverse (555104), we get a palindrome (956659).

The spelling of 401555 in words is "four hundred one thousand, five hundred fifty-five".