401564 has 6 divisors (see below), whose sum is σ = 702744. Its totient is φ = 200780.

The previous prime is 401551. The next prime is 401567. The reversal of 401564 is 465104.

It is a happy number.

It is a super-2 number, since 2×401564² = 322507292192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401567) 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 as a sum of consecutive naturals, namely, 50192 + ... + 50199.

It is an arithmetic number, because the mean of its divisors is an integer number (117124).

2⁴⁰¹⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

401564 is a deficient number, since it is larger than the sum of its proper divisors (301180).

401564 is a wasteful number, since it uses less digits than its factorization.

401564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100395 (or 100393 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 401564 is about 633.6907763255. The cubic root of 401564 is about 73.7765355054.

Adding to 401564 its reverse (465104), we get a palindrome (866668).

The spelling of 401564 in words is "four hundred one thousand, five hundred sixty-four".