401605 has 8 divisors (see below), whose sum is σ = 497664. Its totient is φ = 310800.

The previous prime is 401593. The next prime is 401627. The reversal of 401605 is 506104.

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

It is not a de Polignac number, because 401605 - 2⁷ = 401477 is a prime.

It is a super-2 number, since 2×401605² = 322573152050, which contains 22 as substring.

It is a Duffinian number.

401605 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1141 + ... + 1450.

It is an arithmetic number, because the mean of its divisors is an integer number (62208).

2⁴⁰¹⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

401605 is a deficient number, since it is larger than the sum of its proper divisors (96059).

401605 is a wasteful number, since it uses less digits than its factorization.

401605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 401605 is about 633.7231256629. The cubic root of 401605 is about 73.7790463007.

Adding to 401605 its reverse (506104), we get a palindrome (907709).

The spelling of 401605 in words is "four hundred one thousand, six hundred five".