405620 has 24 divisors (see below), whose sum is σ = 902664. Its totient is φ = 152576.

The previous prime is 405611. The next prime is 405641. The reversal of 405620 is 26504.

It can be written as a sum of positive squares in 4 ways, for example, as 85264 + 320356 = 292^2 + 566^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

405620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257 + ... + 936.

It is an arithmetic number, because the mean of its divisors is an integer number (37611).

2⁴⁰⁵⁶²⁰ is an apocalyptic number.

It is an amenable number.

405620 is an abundant number, since it is smaller than the sum of its proper divisors (497044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405620 is a wasteful number, since it uses less digits than its factorization.

405620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 405620 is about 636.8830347874. The cubic root of 405620 is about 74.0240973384.

The spelling of 405620 in words is "four hundred five thousand, six hundred twenty".