1317440 has 56 divisors (see below), whose sum is σ = 3291840. Its totient is φ = 501248.

The previous prime is 1317427. The next prime is 1317443. The reversal of 1317440 is 447131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1317443) 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, 7271 + ... + 7449.

2^1317440 is an apocalyptic number.

1317440 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 1317440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1645920).

1317440 is an abundant number, since it is smaller than the sum of its proper divisors (1974400).

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

1317440 is a wasteful number, since it uses less digits than its factorization.

1317440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1317440 is about 1147.7978916168. The cubic root of 1317440 is about 109.6251704848.

The spelling of 1317440 in words is "one million, three hundred seventeen thousand, four hundred forty".