405652 has 24 divisors (see below), whose sum is σ = 793800. Its totient is φ = 180096.

The previous prime is 405641. The next prime is 405659. The reversal of 405652 is 256504.

It can be written as a sum of positive squares in 4 ways, for example, as 1156 + 404496 = 34^2 + 636^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405659) by changing a digit.

405652 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 1374 + ... + 1642.

It is an arithmetic number, because the mean of its divisors is an integer number (33075).

2⁴⁰⁵⁶⁵² is an apocalyptic number.

It is an amenable number.

405652 is a deficient number, since it is larger than the sum of its proper divisors (388148).

405652 is a wasteful number, since it uses less digits than its factorization.

405652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 405652 is about 636.9081566443. The cubic root of 405652 is about 74.0260439130.

The spelling of 405652 in words is "four hundred five thousand, six hundred fifty-two".