1312605 has 40 divisors (see below), whose sum is σ = 2694912. Its totient is φ = 598752.

The previous prime is 1312603. The next prime is 1312637. The reversal of 1312605 is 5062131.

It is not a de Polignac number, because 1312605 - 2¹ = 1312603 is a prime.

1312605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312601) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2604 + ... + 3066.

2^1312605 is an apocalyptic number.

1312605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1312605 is an abundant number, since it is smaller than the sum of its proper divisors (1382307).

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

1312605 is an equidigital number, since it uses as much as digits as its factorization.

1312605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1312605 is about 1145.6897485794. The cubic root of 1312605 is about 109.4908980988.

Adding to 1312605 its reverse (5062131), we get a palindrome (6374736).

The spelling of 1312605 in words is "one million, three hundred twelve thousand, six hundred five".