405486 has 20 divisors (see below), whose sum is σ = 908952. Its totient is φ = 135108.

The previous prime is 405473. The next prime is 405487. The reversal of 405486 is 684504.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1090 + ... + 1413.

2⁴⁰⁵⁴⁸⁶ is an apocalyptic number.

405486 is an abundant number, since it is smaller than the sum of its proper divisors (503466).

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

405486 is a wasteful number, since it uses less digits than its factorization.

405486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 405486 is about 636.7778262471. Note that the first 3 decimals coincide. The cubic root of 405486 is about 74.0159449449.

The spelling of 405486 in words is "four hundred five thousand, four hundred eighty-six".