1317728 has 12 divisors (see below), whose sum is σ = 2594340. Its totient is φ = 658848.

The previous prime is 1317727. The next prime is 1317751. The reversal of 1317728 is 8277131.

It is a self number, because there is not a number n which added to its sum of digits gives 1317728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20558 + ... + 20621.

It is an arithmetic number, because the mean of its divisors is an integer number (216195).

2^1317728 is an apocalyptic number.

It is an amenable number.

1317728 is a deficient number, since it is larger than the sum of its proper divisors (1276612).

1317728 is an equidigital number, since it uses as much as digits as its factorization.

1317728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41189 (or 41181 counting only the distinct ones).

The product of its digits is 2352, while the sum is 29.

The square root of 1317728 is about 1147.9233423883. The cubic root of 1317728 is about 109.6331581348.

The spelling of 1317728 in words is "one million, three hundred seventeen thousand, seven hundred twenty-eight".