401855 has 8 divisors (see below), whose sum is σ = 486000. Its totient is φ = 318976.

The previous prime is 401839. The next prime is 401861. The reversal of 401855 is 558104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401855 - 2⁴ = 401839 is a prime.

It is a super-2 number, since 2×401855² = 322974882050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671 + ... + 1119.

It is an arithmetic number, because the mean of its divisors is an integer number (60750).

2⁴⁰¹⁸⁵⁵ is an apocalyptic number.

401855 is a deficient number, since it is larger than the sum of its proper divisors (84145).

401855 is a wasteful number, since it uses less digits than its factorization.

401855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 401855 is about 633.9203419989. The cubic root of 401855 is about 73.7943523316.

Adding to 401855 its reverse (558104), we get a palindrome (959959).

The spelling of 401855 in words is "four hundred one thousand, eight hundred fifty-five".