1317420 has 72 divisors (see below), whose sum is σ = 4311216. Its totient is φ = 323712.

The previous prime is 1317419. The next prime is 1317427. The reversal of 1317420 is 247131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1317393 and 1317402.

It is not an unprimeable number, because it can be changed into a prime (1317427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2059 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (59878).

2^1317420 is an apocalyptic number.

1317420 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 1317420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2155608).

1317420 is an abundant number, since it is smaller than the sum of its proper divisors (2993796).

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

1317420 is a wasteful number, since it uses less digits than its factorization.

1317420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1317420 is about 1147.7891792485. The cubic root of 1317420 is about 109.6246157436.

The spelling of 1317420 in words is "one million, three hundred seventeen thousand, four hundred twenty".