1306605 has 8 divisors (see below), whose sum is σ = 2090592. Its totient is φ = 696848.

The previous prime is 1306601. The next prime is 1306633. The reversal of 1306605 is 5066031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1306605 - 2² = 1306601 is a prime.

It is a super-3 number, since 3×1306605³ = 6691973338942185375, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43539 + ... + 43568.

It is an arithmetic number, because the mean of its divisors is an integer number (261324).

2^1306605 is an apocalyptic number.

1306605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1306605 is a deficient number, since it is larger than the sum of its proper divisors (783987).

1306605 is an equidigital number, since it uses as much as digits as its factorization.

1306605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87115.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1306605 is about 1143.0682394328. The cubic root of 1306605 is about 109.3238133277.

The spelling of 1306605 in words is "one million, three hundred six thousand, six hundred five".