1317840 has 120 divisors (see below), whose sum is σ = 4568160. Its totient is φ = 313344.

The previous prime is 1317839. The next prime is 1317853. The reversal of 1317840 is 487131.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1317840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69351 + ... + 69369.

It is an arithmetic number, because the mean of its divisors is an integer number (38068).

2^1317840 is an apocalyptic number.

1317840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1317840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2284080).

1317840 is an abundant number, since it is smaller than the sum of its proper divisors (3250320).

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

1317840 is a wasteful number, since it uses less digits than its factorization.

1317840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1317840 is about 1147.9721250971. The cubic root of 1317840 is about 109.6362641288.

The spelling of 1317840 in words is "one million, three hundred seventeen thousand, eight hundred forty".