401845 has 4 divisors (see below), whose sum is σ = 482220. Its totient is φ = 321472.

The previous prime is 401839. The next prime is 401861. The reversal of 401845 is 548104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165649 + 236196 = 407^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 401845 - 2⁵ = 401813 is a prime.

It is a super-3 number, since 3×401845³ = 194669073331278375, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40180 + ... + 40189.

It is an arithmetic number, because the mean of its divisors is an integer number (120555).

2⁴⁰¹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

401845 is a deficient number, since it is larger than the sum of its proper divisors (80375).

401845 is an equidigital number, since it uses as much as digits as its factorization.

401845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80374.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 401845 is about 633.9124545235. The cubic root of 401845 is about 73.7937402122.

Adding to 401845 its reverse (548104), we get a palindrome (949949).

The spelling of 401845 in words is "four hundred one thousand, eight hundred forty-five".