663405 has 16 divisors (see below), whose sum is σ = 1085184. Its totient is φ = 345920.

The previous prime is 663371. The next prime is 663407. The reversal of 663405 is 504366.

663405 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 663405 - 2⁸ = 663149 is a prime.

663405 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (67824).

2⁶⁶³⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

663405 is a deficient number, since it is larger than the sum of its proper divisors (421779).

663405 is a wasteful number, since it uses less digits than its factorization.

663405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 663405 is about 814.4967771575. The cubic root of 663405 is about 87.2153470870.

The spelling of 663405 in words is "six hundred sixty-three thousand, four hundred five".