1317645 has 48 divisors (see below), whose sum is σ = 2695680. Its totient is φ = 582912.

The previous prime is 1317629. The next prime is 1317671. The reversal of 1317645 is 5467131.

1317645 is a `hidden beast` number, since 1 + 3 + 17 + 645 = 666.

It is not a de Polignac number, because 1317645 - 2⁴ = 1317629 is a prime.

It is a super-3 number, since 3×1317645³ = 6863039679594333375, which contains 333 as substring.

1317645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14761 + ... + 14849.

It is an arithmetic number, because the mean of its divisors is an integer number (56160).

2^1317645 is an apocalyptic number.

1317645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1317645 is an abundant number, since it is smaller than the sum of its proper divisors (1378035).

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

1317645 is a wasteful number, since it uses less digits than its factorization.

1317645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 151 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 1317645 is about 1147.8871895792. The cubic root of 1317645 is about 109.6308562578.

It can be divided in two parts, 131764 and 5, that added together give a square (131769 = 363²).

The spelling of 1317645 in words is "one million, three hundred seventeen thousand, six hundred forty-five".