1405663 has 6 divisors (see below), whose sum is σ = 1635216. Its totient is φ = 1204812.

The previous prime is 1405643. The next prime is 1405669. The reversal of 1405663 is 3665041.

It is not a de Polignac number, because 1405663 - 2⁵ = 1405631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14295 + ... + 14392.

It is an arithmetic number, because the mean of its divisors is an integer number (272536).

2^1405663 is an apocalyptic number.

1405663 is a deficient number, since it is larger than the sum of its proper divisors (229553).

1405663 is an equidigital number, since it uses as much as digits as its factorization.

1405663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28701 (or 28694 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1405663 is about 1185.6065957981. The cubic root of 1405663 is about 112.0195278450.

The spelling of 1405663 in words is "one million, four hundred five thousand, six hundred sixty-three".